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CARB TRAILER CERTIFICATION APPLICATION - GUIDANCE DOCUMENT This guidance document is designed to help you fill out your CARB trailer certification application web form. If you have any additional questions, please contact CARB at TrailerCert@arb.ca.gov. How to use the online form:

1. Download the HTML application document from the Trailer Certification website and open it using a web browser (we recommend using Google Chrome).

2. Fill out all fields that are required. 3. After you complete filling out all fields, click the button ‘Check for Errors’ located at the

bottom of the page. It will notify you if there are any other required fields that are not filled out.

4. Once all necessary fields are entered, you may click ‘Save Form’. This will save the file as an “.xml” file.

5. Email this form along with all required documents to TrailerCert@arb.ca.gov. Tip: To save a partially completed form to work on it later you may click ‘Save Form’, and save the XML file. Then, you may click ‘Import XML File”, select the saved XML file, and press open. This will open the data that you entered previously.

PART I: USER INFORMATION

• U.S. EPA Manufacturer Code: Provide your 3-letter U.S. EPA manufacturer code. The manufacturer code is a unique 3-letter code assigned to a manufacturer by U.S. EPA.

o If you already have a U.S. EPA manufacturer code, please include a copy of any communication letter or email from U.S. EPA that lists the Mfr. code prior to submitting the trailer certification application. Submit this via email to TrailerCert@arb.ca.gov.

o If you do not already have a U.S. EPA manufacturer code, register for a unique manufacturer code by following the instructions located here. When submitting this application, include a copy of the U.S. EPA email issuing you the 3-letter mfr. code.

• Manufacturer Name: List your company name. • Company Address: List your company headquarters street, city, state, and zip code. • Contact Job Title/Position: List the job title of the contact. • Contact First and Last Name: List the full legal name of the person who will be the point

of contact between your company and CARB. • Contact Email Address: List the email address of the contact. CARB staff may need to

reach out for follow-up information. • Contact Phone Number: List the direct business telephone number of the contact.

PART II: GENERAL INFORMATION

• Process Code: o New Submission: Select this option if this is your first time filling out this form for

this specific trailer family and year. o Running Change: A running change applies to making a change to an already

certified trailer. Select this option if you have already submitted a trailer certification form and received an Executive order, and are making a change. For example, adding a new aero device to the trailer family, adding a new tire offering, etc.

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Running Change Type: If you select ’Running Change’, choose thereason from the dropdown list. In addition, please describe the runningchange in the ‘Field Edits/Changes/Corrections’ field, and explain why itwill not result in an increase in emissions.

o Correction: Select this option if you have already filled out a form for this specificmodel year and trailer family but submitted it to CARB with an error that you arenow correcting.

• Trailer Family Name: Provide the trailer family name as shown in the example below. Afamily is a grouping of similar trailers made by one manufacturer that are all subject to thesame standard and covered by a single CARB executive order.

o This is a 12-digit code that is chosen by the manufacturer, but must adhere to therules stated in the table below.

Example: LABC3TRLRM01

CHARACTER CHARACTER POSITION DESCRIPTION

L 1 Model Year Code: L=2020, M=2021, N=2022, P=2023, etc.

ABC 2-4 U.S. EPA assigned Manufacturer Code

3 5 Industry Sector Code: Must be “3” for trailers

TRLR 6-9 Family Type Descriptor: Must be “TRLR” for Heavy-Duty Highway Trailers

M01 10-12

Any combination of valid characters (numbers and/or alphabetic letters) chosen by the manufacturer to provide a unique identification for the family name. (i.e. “AAA”, “M01”, “123”, etc.) It is recommended that numbers and letters be selected that minimize possible confusion between other

trailer families submitted for certification by the manufacturer.

• Model Year: List the model year for which you are certifying the specific trailer family. Asdefined in 40 CFR § 1037.801, model year means the manufacturer's annual new modelproduction period. It must include January 1 of the calendar year for which the model yearis named, may not begin before January 2 of the previous calendar year, and it must endby December 31 of the named calendar year. The model year may be set to match thecalendar year corresponding to the date of manufacture. For example, a model year 2021trailer may have a maximum production period of 1/2/20 to 12/31/21.

• Useful Life (years): Enter the trailer family’s useful life. Useful life of trailers is 10 yearsin CA Phase 2.

• Field Edits/Changes/Corrections: List the fields that you have made changes to (forexample: trailer family name, trailer family subcategory, production start date, etc.) andprovide a summary of the changes made.

• Trailer Family Subcategory: Select the category that describes the trailer you arecertifying. Select only one option. If you will be combining multiple trailers subcategories,select the type with the most stringent standards (see Reference Table 1 and Reference

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Table 2). For example, if you will be combining Full-Aero Long Dry Box Van and Full-Aero Long Refrigerated Box Van subcategories, select Full-Aero Long Dry Box Van as the subcategory in this field since it has more stringent CO2 standards. The trailer subcategories are designed to help distinguish the different types of trailers, their lengths, and aerodynamic equipment capabilities.

o A ‘long box’ is any trailer that is longer than 50 ft.o A ‘short box’ is any trailer that is 50 ft. or shorter.o A trailer is ‘full-aero’ when it has no side or rear Work-Performing Equipment

(WPE)o A long box-van trailer is considered ‘partial-aero’ when it has either side or rear

WPE.o A short box-van trailer is considered ‘partial-aero’ when it has side WPEo A long box-van trailer is considered ‘non-aero’ when it has both side and rear WPE.o A short box-van trailer 35-50 ft. is considered ‘non-aero’ when it has both side and

rear WPE.o A short box-van trailer less than 35 ft. is considered ‘non-aero’ when it has side

WPE and has a front-mounted Transport Refrigeration Unit (TRU).o A refrigerated van is a box van with self-contained HVAC system. Note that this

includes systems that provides cooling, heating, or both. All other box vans are dryvans.

o A dry van is a trailer with enclosed cargo space that is permanently attached to thechassis, with fixed sides, nose, and roof. Tank trailers are not box vans.

o For purposes of this regulation, non-box trailers that are required to be certified arelimited to flatbed trailers, container-chassis trailers, and tank trailers.

For an explanation of WPE, please read the section below called “For Partial-Aero or Non-Aero Trailers Only”.

• Are you combining trailer subcategories into a single family? If you are certifyingmultiple subcategories of trailers as a single family to the same standard, select ALL thesubcategories that apply. For example, you may combine Full-Aero Long Dry Box Vantrailer and Full-Aero Long Refrigerated Box Van trailer subcategories together andcomplete only one application. You would select both subcategories in this section. Notethat all trailers will need to meet the CO2 emission standards of the more stringent trailersubcategory. In this case, it would be the Long Dry Box Van trailer subcategory.

TRAILER CONFIGURATIONS Each trailer family may have more than one configuration, for example, different lengths of trailers, or side/rear WPE options. Enter three configurations to describe a range of trailers that will be manufactured. The first configuration is the shortest, second is the longest, and third is the most produced. If you are combining dissimilar trailer subcategories, you must enter the three configurations for each subcategory. For each configuration, answer the following:

o Trailer Aerodynamic Category: Select whether the trailer is a full-aero box van,partial-aero box van, non-aero box, or non-box trailer.

o Trailer Climate Control Type: If you have a box trailer, select if it is a dry orrefrigerated van. If you selected a non-box trailer, disregard this field entry.

o Trailer Length: Enter the length of the trailer in feet to one decimal place (forexample 53.0). Configuration 1: The shortest configuration Configuration 2: The longest configuration Configuration 3: The most produced configuration

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For Partial-Aero or Non-Aero Trailers Only: o Rear Work-Performing Equipment (WPE): Select yes or no to indicate if any rear

WPE will be installed on this trailer configuration. Rear WPE is any kind ofequipment installed on a rear of a trailer that that inhibits the use of aerodynamictechnologies and thus impedes the trailer’s ability to meet standards predicated onuse of aerodynamic technologies.

o Side Work-Performing Equipment (WPE): Select yes or no to indicate if any sideWPE will be installed on this trailer configuration. Side WPE is any kind ofequipment installed on the sides of a trailer that inhibits the use of aerodynamictechnologies and thus impedes the trailer’s ability to meet standards predicated onuse of aerodynamic technologies.

Click the ‘Add’ button to add more than one trailer configuration. Additional details on your configurations need to be provided in the comments section. Please see the Trailer Family Comments section below for more information.

• Does this trailer family contain any adjustable parameters as described in§1037.205(p)?: Select yes or no to indicate whether there are any adjustable parametersfor this trailer family.

o An adjustable parameter is a device that can be modified to have a different effecton CO2 emissions. For example, a skirt may be installed at different locations of atrailer, moving +/- 1 foot from the front of a trailer. The range description wouldthen explain the intended physically adjustable range, the nominal value, theproduction tolerances, and the limits or stops used to establish such. Adjustableparameters are expected to be very rare in not nonexistent for trailers.

• Do you intend to use the averaging provisions of Part 1037 subpart H: Select yes orno to indicate if you will use averaging to meet the CO2 standards for full-aero dry andrefrigerated box van trailers. Note that the use of averaging to meet the emissionstandards is not allowable until Model Year 2027.

• Estimated Total CA Production Volume (units): List the number of trailers in this familythat you forecast to sell in California for the model year you are certifying. This is anapproximation.

• Do you plan to use Transitional Allowance under 1037.150(v)? If you plan to produceexempt trailers (as explained below) for sale in California, select yes. Otherwise, selectno. Through model year 2026, trailer manufacturers may calculate a number of trailersthat are exempt from the standards and certification requirements as defined in 40 CFR §1037.150(v).Calculate the number of exempt box vans in a given model year by multiplying themanufacturer’s total California-directed production volume of certified box vans by 0.20and rounding to the nearest whole number; however, in no case may the number ofexempted box vans be greater than 350 units in any given model year. Repeat thiscalculation to determine the number of non-box trailers, up to 250 annual units, that areexempt from standards and certification requirements.Perform the calculation based on the manufacturer’s projected production volumes in thefirst year that standards apply; in later years, use actual production volumes from thepreceding model year.In the end-of-year production report that must be submitted within 90 days after the endof the model year, you must include all trailers that were exempt from the standards usingthe transitional allowance provision.

• Production Start Date: List the date you expect to begin manufacturing trailers for themodel year you are certifying.

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• Production End Date: List the date you expect to end manufacturing trailers for the modelyear you are certifying.

• Secondary Manufacturer: Select yes or no to indicate if you are a secondarymanufacturer, as defined in 40 CFR § 1037.801. A secondary manufacturer is anyone thatproduces a trailer by modifying a complete trailer or completing the assembly of a partiallycomplete trailer. If you indicate yes, please fill in the original trailer manufacturer name.

• Trade Name of Trailers in Family: List the trade name of the trailers in this Trailer Family.(Ex. trailer brand and model). Click the ‘Add’ button to add multiple names.

• Trailer Family Comments: Provide additional comments about the trailer family here.Please describe the configurations produced in more detail.

o List the actual trailer lengths that will be produced to the nearest foot (for example,15’, 25’, 28’, 35’, and 45’)

o Summarize the WPE optionso List the axle optionso List the weight reduction componentso List the different tire pressure system options, and write a short description about

their design/operationo List the standard components installed on the family (for example, if all trailers in

the family have an aluminum floor, etc.)o Describe what you think will be the most produced configurationo Describe the worst case configuration that will be available for saleo If you plan to use transitional allowance, list the estimated number of exempted

trailers you plan to produceo List any other information you find to be necessary

• Trailer Assembly Plant Name and Address: List the name of the plant(s) and location(s)of where the trailers are manufactured. Click ‘Add’ to enter multiple plants and theiraddress.

• Are you importing trailers on this trailer family? Select yes or no to indicate if you areimporting trailers in this family into the U.S. If yes, please fill out the following fields:

o Agent for Service in U.S. Name: List the full name of the person in the U.S. thatwill be the point of contact with CARB. This person will be responsible forcompliance of the manufacturer.

o U.S. Port of Import Name: List the name of the U.S. port that will be receiving theimported trailers.

o City: The name of the U.S. City for the applicable port entered above.o State: The name of the U.S. State for the applicable port entered above.

Click the ‘Add’ button to add more than one port of import.

PART III: COMPONENT INFORMATION Emission Control Identifier: Select all the technologies that you will have installed on the trailer family. The abbreviations shown (LRRA, etc.) will be required to be listed on the Emissions label on the trailer. For example, if one trailer will have Dual-wide trailer tires with aluminum wheels (DWAW) and another will have Dual-wide trailer tires with steel wheels (DWSW), you need to select both technologies in this section for the certification application. However, when creating the physical emissions label for each specific trailer, only the technologies installed on that specific trailer go on the label. 1. AERODYNAMIC EQUIPMENTSelect yes or no to indicate whether any aerodynamic improvement devices (such as side skirts or fairings) are used for the trailer family. If you are applying for a non-aero box van or non-box

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trailer, select no. If trailers in the trailer family use aerodynamic improvement devices, fill out either Option A or Option B.

OPTION A: PRE-APPROVED AERODYNAMIC DEVICE

Fill out this option if you have any aerodynamic devices that have been pre-approved via the CARB Interim Aero Device Approval Program. List ALL the devices. All of the approved aero devices and Executive Orders can be found on CARB’s Interim Aero Device Approval Program website.

• Manufacturer of the Aero Device: List the company who manufactured theaero device

• Aero Device Name: List the name of the aerodynamic device• CARB Executive Order Number: List the CARB executive order number for

the approved device• Aero Device Measured ∆CdA value: List the ∆CdA of the device. This can be

found on the executive order of the approved device.Click the ‘Add’ button to add more than one device used in the trailer family.

OPTION B: AERODYNAMIC TEST DATA FOR CARB APPROVAL Fill out this option if you are testing the complete trailer to determine a ∆CdA for the trailer.

• Test Lab Name: List the lab where the trailer was tested• Is this lab owned by another company? Select yes or no to indicate whether

the lab is owned by another company. If the lab is owned by another company,list the name of that company.

• Lab Address: List the street, city, state, and zip code of the location where thelab is located.

• What type of test was performed? Select the type of test that was performedon the trailer to get the ∆CdA.

o Wind-tunnel is a primary test method for testing trailers.o Coast-down testing and Computational Fluid Dynamics (CFD)

modeling are also accepted, however you need to get pre-approval inorder to use these methods. Manufacturers need to demonstratecompliance in accordance with 40 CFR § 1037.528 and 40 CFR §1037.532 for Coast-down and CFD, respectively.

o Manufacturers will need to submit a test plan detailing the testingmethodology to CARB which includes the test method, tractor andtrailer specifications, test facility, test conditions, and any otherinformation you may find pertinent. For more information and additionalguidance, contact CARB at TrailerCert@arb.ca.gov.

• Trailer’s Measured ∆CdA: After you have obtained results from testing, list the∆CdA value. This should be reported to 2 decimal places (for example: 1.39)and in units of m2.

You need to submit a report of all data from which you obtained the ∆CdA value. CARB will review test procedures/calculations for accuracy. You can use the Interim Aero Approval Request form as a template for this report.

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2. TIRE PRESSURE SYSTEMSSelect yes or no to indicate whether there are tire pressure systems on trailers in the trailer family. If there are any tire pressure systems installed on trailers in the trailer family, select all that apply. Tire pressure systems are required on non-box and non-aero trailers.

• Automatic Tire Inflation System (ATIS) – a pneumatically or electronically activated systeminstalled on a vehicle to maintain tire pressure at a preset level. These systems eliminatethe need to manually inflate tires.

• Tire Pressure Monitoring System (TPMS) – a vehicle system that monitors air pressure ineach tire and alerts the operator when tire pressure falls below a specified value.

3. TIRE CONFIGURATIONS (for all trailers)Complete the data below for all tire options that will be used in the trailer family. You may add more than one configuration by clicking ‘Add Tire Configuration’.

• Tire Manufacturer: List the manufacturer of the tires used on the trailer. For example –Continental.

• Tire Model: List the model of the tires given by the manufacturer. For example – HSL2Eco Plus (G).

• Tire CRR (Coefficient of Rolling Resistance) Rating: This is also known as Tire RollingResistance Level (TRRL). Manufacturers will determine these values by performing testsaccording to 40 CFR 1037.520(c). Alternatively, you can obtain the test results from thetire manufacturer, or another third party. This value should be reported to 1 decimal place(for example: 6.4) and in units of kg/metric ton.

• Tire Size: List the size of the tires on the trailer. For example – 275/80R22.5

If you choose to obtain test results from a tire manufacturer or another third party, you must obtain a signed statement from the party supplying those test results to verify that tests were conducted according to the requirements of 40 CFR 1037, and submit it to CARB as part of the certification application. The required tire information in the statement is listed below:

o Tire Manufacturero Tire Modelo Tire Sizeo Tire CRR

Another option for entering tire information into the web application is to upload a CSV file with a list of multiple tire options. A tire data CSV submission instruction document can be found on the trailer certification webpage. Once you have filled out this spreadsheet and saved the CSV, click ‘Browse’ to select that document, and then click ‘Upload Tire Configurations from a CSV File’. This will auto-populate all the necessary fields.

• Axle configuration: Select the axle configuration(s) available for the trailer family. Youcan select more than one configuration.

o Single: Select this option if each trailer has one axle.o Double: Select this option if each trailer has two axles.o Triple: Select this option if each trailer has three axles.

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4. WEIGHT REDUCTIONNon-Wheel Weight Reduction Select yes or no if you will have any non-wheel weight reduction technology (listed in 40 § 1037.515(d)(2)) installed on trailers in the trailer family.

• If yes, select all non-wheel weight reductions used in this trailer family regardlessof whether every trailer in the family is using this technology or not.

• If you do not see an option for your specific technology, it may qualify as an “Off-Cycle Technology”. Contact CARB staff for assistance.

Wheel Weight Reduction Select yes or no if you will have any wheel related weight reduction technology (as listed in 40 CFR § 1037.520(e)(1)) installed on trailers in the trailer family. If yes, list the different configurations that will be offered. For each configuration:

• Select the type of wheel, the material of the wheel, and the number of wheels withthe combination of wheel type and material.

o For example, your first configuration may have aluminum wheels with Dual-wide trailer tires. This configuration would require 8 wheels for a double-axle trailer. Your second configuration may have aluminum wheels withwide-base single trailer tires. This configuration would require 4 wheels fora double-axle trailer.

• Select all wheel weight reductions used in this trailer family regardless of whetherevery trailer in the family using this technology or not.

• If you do not see an option for your specific technology, it may qualify as an “Off-Cycle Technology”. Contact CARB staff for assistance.

5. OFF-CYCLE TECHNOLOGYSelect yes or no to indicate if this trailer family uses an approved off-cycle technology. An off-cycle technology is any innovative device or technology that is not in common use and is not recognized in the compliance equation (Reference Figure 1), but that functions to reduce CO2 emissions. Examples of approved Phase 2 technologies recognized in the compliance equation, include, but are not limited to those listed in 40 CFR § 1037.520(e)(1), 40 CFR § 1037.515(d)(2). To get credit for an off-cycle technology, the manufacturer must test it to demonstrate CO2 emission reductions (as described further below) and must receive written approval from CARB certification staff and an email confirmation through trailercert@arb.ca.gov. Contact CARB in advance to discuss appropriate test procedures before conducting testing of an Off-Cycle Technology. Approval will only be given for technologies that will result in measurable, demonstrable, and verifiable real-world CO2 emission reductions. After you are approved by CARB trailer certification staff to proceed with testing, apply the off-cycle provisions defined in 40 CFR § 1037.610 to trailers as follows (see 40 CFR § 1037.515(e)):

• Improvement factor: If your off-cycle technology reduces emissions in a way that isproportional to measured emissions, multiply the trailer's CO2 emission rate by theappropriate improvement factor. Calculate improvement factors as the ratio of in-useemissions with the technology divided by the in-use emissions without the technology.

• Separate Credit: If your off-cycle technology does not yield emission reductions that areproportional to measured emissions, calculate an adjusted CO2 emission rate for yourtrailers by subtracting the appropriate off-cycle credit. Calculate the off-cycle credits (g/ton-mile) based on the difference between the in-use emission rate with the technology and

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the in-use emission rate without the technology. Subtract this value from your compliance equations result.

• Weight Reduction: You may account for weight reduction based on measured values bycompleting A to B testing (as specified in 40 CFR § 1037.515(e)(1)), comparing the weightof a trailer in a certified configuration to the weight of an equivalent trailer without weight-reduction technologies. Additional weight reduction is applied to the “WR” parameter inthe compliance equation.

For additional information on Off-Cycle Technology for trailers, please refer to 40 CFR §1037.515(e).To submit your approval request to CARB, you must include:

• A detailed description of the off-cycle technology and how it functions to reduce CO2emissions

• A list of vehicle configurations that will be equipped with the technology• A detailed description and justification of the selected test vehicles• All testing and simulation data• A description of the methodology used to estimate the off-cycle benefit of the technology

and all supporting data• An estimate of the off-cycle benefit by vehicle model, and the fleet wide benefit based on

projected sales of vehicle models equipped with the technology• A demonstration of the in-use durability of the technology based on any available

engineering analysis or durability testing data• A recommended method for auditing production vehicles

Contact CARB via TrailerCert@arb.ca.gov if you wish to pursue an off-cycle technology credit. If you have an approved off-cycle technology, enter the following:

• Off-Cycle Technology ID: List the alphanumeric code used to identify a unique off-cycletechnology for this Trailer Family. This code is provided by CARB upon approval of use.

• Off-Cycle Technology Name: List the off-cycle technology name.• Off-Cycle Technology Approval Date: List the date that this off-cycle technology was

approved by CARB.• Off-Cycle Technology Improvement Type: Select the type of improvement as discussed

above:o Improvement factoro Separate-credito Improvement factor and separate-credito Weight reduction

• Off-Cycle Improvement Factor: List the off-cycle improvement factor rounded to fourdecimal places. If this does not apply to you, write ‘0’.

• Off-Cycle Emission Rate Separate Credit Amount: List the off-cycle separate creditrounded to two decimal places. (g CO2/ton-mile). If this does not apply to you, write ‘0’.

• Off-Cycle Weight Reduction: List the off-cycle weight reduction in pounds rounded to aninteger. If this does not apply to you, write ‘0’.

• Off-Cycle Technology Projected Production Volume: List the estimated number ofunits that will be manufactured with this off-cycle technology.

• Off-Cycle Technology Description: Write a description of the off-cycle technology.

PART IV: EMISSION DETERMINATION You only need to submit the CO2 emission rate (eCO2) for the highest projected CO2 trailer configuration (worst performing configuration) in the trailer family until Model Year 2027.

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Starting in Model Year 2027, manufacturers have the option to use averaging to meet the CO2 standards for full-aero dry and refrigerated box van trailers. To calculate the CO2 emission rate (eCO2) in 2027 and later:

• If averaging, the projected production-weighted CO2 average (including deficits) mustmeet applicable subcategory standard. Manufacturers will need to calculate the averageCO2 emission value based off the worst case subfamily (highest CO2 value), best casesubfamily (lowest CO2 value), and the highest projected sale subfamily.

• If not averaging, all configurations in a family must meet the standard. Manufacturers willneed to calculate for the highest projected CO2 (worst performing) configuration. Note thatthe transitional allowance is no longer available for use starting with the 2027 MY.

Tire CRR: The Rolling Resistance Coefficient (CRR) for the tires used on the trailer configuration (also known as "TRR Level" or "TRRL" as defined in Part 1037.801) in kg/metric ton

• Should be reported to 1 decimal placeConfiguration Aerodynamic Improvement Indicator: Select yes or no to indicate whether the configuration utilizes any aerodynamic equipment. Configuration Composite Delta CdA (m2): Input the aerodynamic delta CdA value to 2 decimal places for the configuration. If aero was not used (i.e., ‘No’ was selected for configuration aerodynamic improvement indicator), write 0.00.

Combining ∆CdA Values for Multiple Aero Devices: If you have more than one pre-approved aero device installed on the configuration, you need to combine the aerodynamic devices’ ∆CdA values using the equation below.

[(𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴1 × 1) + (𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴2 × 0.9) + (𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴3 × 0.8)+ (𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴(𝑥𝑥) × 0.8) … ] = 𝐶𝐶𝐴𝐴𝐶𝐶𝐶𝐶𝐴𝐴𝐶𝐶𝐴𝐴𝐶𝐶 ∆𝐶𝐶𝑑𝑑𝐴𝐴

To compute this equation, you would fully count the technology with largest delta CdA value, discount the second by 10 percent, and discount each of the remaining additional technologies by 20 percent. For example, if a manufacturer is applying four separately tested devices with delta CdA values of 0.50, 0.40, 0.30, and 0.10 they would calculate the combined delta CdA as:

[(0.50 × 1) + (0.40 × 0.9) + (0.30 × 0.8) + (0.10 × 0.8) ] = 𝐶𝐶𝐴𝐴𝐶𝐶𝐶𝐶𝐴𝐴𝐶𝐶𝐴𝐴𝐶𝐶 ∆𝐶𝐶𝑑𝑑𝐴𝐴

Total Weight Reduction (pounds): List the total weight reduction for the configuration. Total Weight Reduction includes any approved Off-Cycle Weight Reduction technologies, as well as any wheel-related weight reduction. Note: weight reduction is a positive value. For example, if you have an aluminum floor, you would have a 375 pound weight reduction, so you would insert ‘375’ into the equation. Use Reference Tables 6, and 7 below as references.

• If you have no weight reduction technology installed, write ‘0’.Tire Pressure System: Select the Tire Pressure System for this configuration type.

• ATIS = Automatic Tire Inflation System on all axles• TPMS = Tire Pressure Monitoring System on all axles• COMB = Combination of ATIS and TPMS across all axles• NONE = One or more axles have no tire pressure system

Configuration Off-Cycle Improvement Factor: List the Off-Cycle Improvement Factor for this configuration type. It must be one of the approved off-cycle improvement factors for this family. If CARB has not approved an Off-Cycle Improvement Factor, write '1'.

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Off-Cycle Separate Credit Amount (g CO2/ton-mile): List the Off-Cycle separate credit amount. Must be one of the approved Off-Cycle Separate Credit Amounts. If CARB has not approved an Off-Cycle Separate Credit Amount, write '0'. CO2 Emission Rate (g/ton-mile): Calculate and list the CO2 emission rate from the configuration. If you are applying for a non-box/non-aero trailer, enter ‘0’. CO2 Emission Standard (g/ton-mile): List the CO2 emission standard for the subcategory that you are certifying. If you are combining dissimilar subcategories in one application, list the CO2 emission standard for the most stringent subcategory. If you are applying for a non-box/non-aero trailer, enter ‘0’.

ADDITIONAL SUPPORTING DOCUMENTS In addition to the application for trailer certification, please include a copy of the warranty statement, sample emission control label, maintenance instructions, test data, tire information report, a statement of compliance, and other relevant supporting documents. Examples for these can be found on the trailer certification webpage.

For the benefit of applicants, CARB has created a compliance verification spreadsheet to help with calculating the trailer CO2 emissions to determine if a trailer will meet the CA Phase 2 standards. This spreadsheet is available here.

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REFERENCE TABLES Reference Table 1 – Phase 2 CO2 Standards for Full-Aero Box Vans (g/ton-mile)

Model Year Dry Van Refrigerated Van

Long Short Long Short 2018-2020 81.3 125.4 83.0 129.1 2021-2023 78.9 123.7 80.6 127.5 2024-2026 77.2 120.9 78.9 124.7

2027+ 75.7 118.8 77.4 122.7

Reference Table 2 – Phase 2 CO2 Standards for Partial-Aero Box Vans (g/ton-mile)

Model Year Dry Van Refrigerated Van

Long Short Long Short 2018-2020 81.3 125.4 83.0 129.1

2021+ 80.6 123.7 82.3 127.5

Reference Table 3 – Phase 2 Non-Box/Non-Aero Trailer Requirements Required Design

Specifications Tire CRR (kg/metric-ton) Tire Pressure

System Type MY 2018-2020 MY 2021+ Non-Box ≤6.0 ≤5.1 TPMS or ATIS Non-Aero ≤5.1 ≤4.7 TPMS or ATIS

Reference Table 4 - Bin Determinations for Trailers Based on Aerodynamic Test Results [ΔCdA in m2]

If a trailer's measured ΔCdA is: Then, designate the trailer as:

And use the following value for ΔCdA in equation:

≤0.09 Bin I 0.0 0.10-0.39 Bin II 0.1 0.40-0.69 Bin III 0.4 0.70-0.99 Bin IV 0.7 1.00-1.39 Bin V 1.0 1.40-1.79 Bin VI 1.4

≥1.80 Bin VII 1.8

Reference Table 5 – Regression Coefficients for Calculating CO2 Emissions

Trailer Category C1 C2 C3 C4 C5

None TPMS (or mix) ATIS

Long Dry Box Van 76.1 1.67 -5.82 -0.00103

1.000 0.990 0.988 Long Refrigerated Box Van 77.4 1.75 -5.78 -0.00103

Short Dry Box Van 117.8 1.78 -9.48 -0.00258Short Refrigerated Box Van 121.1 1.88 -9.36 -0.00264

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Reference Table 6 – Non-Wheel Weight Reductions for Trailers (pounds)

Component Material Weight Reduction (pounds)

Structure for Suspension Assembly1 Aluminum 280 Hub and Drum (per axle) Aluminum 80

Floor2 Aluminum 375 Floor2 Composite (wood and plastic) 245

Floor Cross-members2 Aluminum 250 Landing Gear Aluminum 50

Rear Door Aluminum 187 Rear Door Surround Aluminum 150

Roof Bows Aluminum 100 Side Posts Aluminum 300 Slider Box Aluminum 150

Upper Coupler Assembly Aluminum 430 1For tandem-axle suspension sub-frames made of aluminum, apply a weight reduction of 280 pounds. Use good engineering judgment to estimate a weight reduction for using aluminum sub-frames with other axle configurations. 2 Calculate a smaller weight reduction for short trailers by multiplying the indicated values by 0.528 (28/53).

Reference Table 7 – Wheel-Related Weight Reductions (pounds)

Wheel-Reduction Technology Weight Reduction – Phase 2 (pounds per wheel)

Wide-Base Single Trailer Tire with:

Steel Wheel 84 Aluminum or Aluminum Alloy Wheel 131

Dual-Wide Trailer Tire with1:

High-Strength Steel Wheel 8 Aluminum Wheel 25 Light-Weight Aluminum Alloy Wheel 25

1The weight reduction for wide-base tires accounts for reduced tire weight relative to dual-wide tires.

Reference Table 8 – Combined Aero Trailer ΔCdA Equation

Aero Multiplier Aero Device 1 1 Aero Device 2 0.9

Aero Device 3 (and more) 0.8 Example:

[(𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴 ∗ 1) + (𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴2 ∗ 0.9) + (𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴3 ∗ 0.8) + (𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴(𝑥𝑥) × 0.8) … ] = ∆𝐶𝐶𝑑𝑑𝐴𝐴

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REFERENCE FIGURES Reference Figure 1: Compliance Equation

𝐴𝐴𝐶𝐶𝐶𝐶2 = [𝐶𝐶1 + 𝐶𝐶2 ∗ (𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇) + 𝐶𝐶3 ∗ (∆𝐶𝐶𝑑𝑑𝐴𝐴) + 𝐶𝐶4 ∗ (𝑊𝑊𝑇𝑇)] ∗ 𝐶𝐶5

Where:

• C1, C2, C3, C4: Regression coefficients • C5: Tire pressure system type • Tire rolling resistance level (TRRL): Coefficient of Rolling Resistance (CRR) in units of

kg/metric ton • ∆CdA: Change in Drag Area • WR: Weight reduction