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Rick Mowlds, State Sign Specialist
September 24, 2019
MASH
Implementation
What is MASH?
• The Manual for Assessing Safety Hardware
2
• Not the TV Show!
• Specifies tests for roadside hardware
devices
• Six unique Test Levels for longitudinal
barriers
• Test matrices for crash cushions, supports
and work zone devices
• Worst Practical Conditions
Manual for Assessing Safety
Hardware (MASH)
• MASH Implementation Agreement
• Eligibility Letters
– What are they?
• Status – What hardware has been tested
3
Evolution of Crash Procedures
4
1962
1974
1980
1993
2009
2016
Test Vehicle Changes
5
• One of the most noticeable changes from
NCHRP 350 to MASH
NCHRP 350Pickup
MASHPickup
NCHRP 350Small car
MASHSmall car
MASH Evaluation Criteria
• Structural adequacy of the
tested feature
• Occupant risk
• Vehicle trajectory after
impact
6
Barrier Testing
7
Limitations of Crash Testing
8
Vehicle may impact device differently (speed, angle,
not tracking)
Source: NCHRP Report 665
Limitations of Crash Testing
9
• Site conditions may vary (slopes, curbs,
grade, curve, soil conditions)
• Device may be installed differently
AASHTO/FHWA Implementation
Agreement for NHS Highways
10
For contracts on the National Highway System with a letting date after the dates below, only safety hardware evaluated using the 2016 edition of MASH criteria will be allowed for new permanent installations and full replacements:
W-beam barrier and cast-in-place concrete barrier: December 31, 2017
W-beam terminals: June 30, 2018
Cable barrier, cable barrier terminals, and crash cushions: December 31, 2018*
Bridge rails, transitions, all other longitudinal barriers (including portable barriers installed permanently), all other terminals, sign supports, and all other breakaway hardware: December 31, 2019
National Highway System (NHS)
11
• Includes the Interstate Highway System as well
as other roads important to the nation's economy,
defense, and mobility.
• MAP-21 resulted in the addition of 1,200 miles of
Washington roads to the NHS.
• Local Agency NHS List:
https://www.wsdot.wa.gov/mapsdata/travel/hpms/
pdf/LocalAgencyNationalHighwaySystemRoutes2
016inWashington.pdf
What is an Eligibility Letter?
12
• Service to the FHWA Division Offices and States since the 1980’s
• Review of crash tests and evaluations
• If device meets crash test criteria, FHWA issues letter indicating that it is eligible for FHWA reimbursement
• Effective December 31, 2015 FHWA no longer accepts requests for modifications to NCHRP 350 hardware.
• 2 reviews are ongoing by the GAO and Volpe that may recommend changes to this process.
https://safety.fhwa.dot.gov/roadway_dept/countermeasures/faqs/faq_eligibility_letters.cfm
Eligibility Letter Status - Barriers
13
Letters Issued as of 7/17/2019
• W-beam Guardrail – 22 Devices
• Guardrail Transitions – 12 Devices
• Cable Barrier – 5 Devices (MASH 2009)
• Concrete Barrier – 7 Devices
• Bridge Rail – 12 Devices
• Portable Barriers – 34 Devices
• Other – 11 devices
Note- There has been additional testing conducted (NCHRP projects) but Eligibility letters have not been requested
Eligibility Letter Status –Terminals & Crash Cushions
14
Letters Issued as of 7/17/2019
• W-Beam terminals – 9 devices
• Crash Cushions – 11 devices
Eligibility Letter Status –Breakaway Supports
15
Letters Issued as of 7/19/2017
• Sign Post Supports – 2 devices
• Luminaire Supports - 0
Note:
• MASH now requires testing with the PU truck that
was not required under NCHRP 350
• There has been additional testing conducted
(NCHRP projects) but Eligibility letters have not
been requested
Eligibility Letter Status – Work Zone Devices
16
• Letters Issued as of 7/19/2019
• Portable Sign Stands – 13 devices
• Barricades – 8 devices
• Longitudinal Channelizers – 23 devices
• Delineators – 7 devices
• Other – 2 devices
Note – MASH now requires testing with the PU
truck that was not required under NCHRP 350
Questions??
17
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