Lighting Design Impacts of IES RP- 8 Changesconferences.illinois.edu/the/webpdf/ANDERSON.pdf · Lighting Design Impacts of IES RP- 8 Changes Marty Anderson Bureau Chief, IDOT District

IDOT ~ Bureau of Electrical Operations

Lighting Design Impactsof IES RP- 8 Changes

Marty AndersonBureau Chief, IDOT District 1 Bureau of Electrical Operations


NOTE:

IDOT, District 1 requirementsreferenced in this presentation areapproximate and subject torefinement as the requirements arefinalized. For final requirements,contact IDOT, Bureau of ElectricalOperations at 847-705-4351


Some perspective….


Key Issues

l Added Design Optionsl Area Classification Changesl Intersection Lighting Changesl Inclusion of Sidewalksl Addition of Railroad Crossingsl High Mast Level Revisions


Added Design Options

l STV addedl Actually uses luminance calculationsl Helps define good/bad layoutl Provides an additional checkl Might allow lower luminance

l Luminance remains a good methodl Illuminance now considers glare


IDOT District 1will require the calculationsusing Pavement Luminance

STV may be used to justifylower luminance results for some

roadway / area classifications


Area Classification Changes

l Focus Shifted from Land Use toPedestrians

l Classification titles have changed ~potential for designer confusion

l Classification applications areessentially the same


Comparisons

l Highl commerciall urban

l Mediuml intermediate: libraries, rec.

centers, etc.

l Lowl residential

l Commerciall businessl central municipal

l Intermediatel libraries, rec. centers,

industrial, etc.

l Residentiall residentiall small commercial

New (Pedestrians)Old (Land Use)


IDOT District 1

will use combined

area classification titles


•Commercial / High

•Intermediate / Medium

•Residential / Low

for Major, Collector & Local roads...


Intersection Lighting Changes

l Intersections now get specificmention (Section 3.6)

l RP- 8 now has defined calculationvalues for intersections (Table 9)

l RP- 8 defines the intersections

but….


Intersection Problems

l Classification is muddled byreference to ITE Guidelines forResidential Subdivision Street Design(that don’t apply)


ITE Residential Subdivision Street Design:

Major over 3,500 ADT

Collector 1,500 to 3,500 ADT

Local 100 to 1,500 ADT

“Note: These …do not apply to the road classificationsof Tables 2, 3 and 4, but may be used in determiningintersection lighting levels from Table 9.” (emphasis added)

large potential conflict


IDOT District 1 will use theroadway lighting classificationsystem for intersection lighting




l Driveways are a problem in practice


RP- 8 says “Driveways... are miniatureintersections and should be classifiedaccordingly.”

RP- 8 recognizes a distinction betweenhigh and low volume driveways.

Engineering judgement must be appliedto lighting levels, transition lighting andpole placements.


l require intersection pole placementat driveways whenever possible

l require intersection levels andcalculations only for signalizeddriveways at shopping centers, etc.

l consider transition only with respectto the lighted right-of-way

IDOT District 1 will….




l Driveways are a problem in practicel Calculation area isn’t clear


RP- 8 provides the recommendedilluminance values for intersections,defined as “...the prolongation of theintersecting roadway edges...”.

huh?How about a diagram?


RP- 8 recommends that “other”conflict areas have illuminance values50% higher than the street

Need a separate calculation?

What’s the calculation area?


RP- 8 states the principle that theintersections should receive light“…equal to the sum of the values foreach separate street…”

That can lead to more than 50%

And in Table 9, it does.




l Driveways are a problem in practicel Calculation area isn’t clearl Only illuminance is considered


l Intersections are the key conflictareas

l Pavement luminance is a superiordesign method

l Pavement luminance should not beignored through intersections

but...


l Apply a calculation area diagram forintersection illuminance per Table 9

l Include adjoining conflict areas intothe one calculation area

l Require pavement luminancecalculations through intersections

IDOT District 1 will….


Illuminance Calculation Area




Inclusion of Sidewalks

l RP- 8 calls for pedestrian areacalculations in conjunction withroadway calculations (Tables 5,6,7,8)

l RP- 8 includes horizontal and verticalilluminance calculations for thepedestrian areas

but….


l RP- 8 does not define a reasonable“zone of inclusion”

l RP- 8 recommendations for verticalilluminance (fc) ignore silhouettevisibility and are unattainable withnormal roadway lighting

l Must balance between pedestrianprotection and limiting fixed objecthazards



l Require the pedestrian area(sidewalk) calculations only if within12 feet of the roadway pavement

l Require only the horizontalcomponents of the pedestrian areacalculations

IDOT District 1 will...



Addition of Railroad Crossings

l RP- 8 Annex D provides guidancerelative to roadway railroad crossings

l RP- 8 calls for vertical illuminance of10 lux on railroad cars, extending atleast 46 meters along the railroadright-of-way on each side of thecrossing

but...


l Highway right-of-way might not allowfor 46-meter coverage on each side ofthe crossing ~ Highway agencies donot have access

l Angled floodlighting is a glare sourceto be avoided

l RP- 8 does not establish calculationplanes; does not clarify 10 lux level



l Require the inclusion of railroadcrossing lighting whenever omissionwould result in an unlighted crossingapproach of less than 1000 feet



l Establish the vertical calculationplanes, each aligned at an outsidetrack rail, extending 12 feet beyondthe edges of traveled pavement, 20feet high, from grade

l Require an average of not less than10 lux on each outside facing plane

IDOT District 1 also will...


High Mast Level Revisions

l RP- 8 eliminates separate lowerrecommended levels for high mastlighting

l RP- 8 allows the illuminance designmethod for high mast lighting

but...


l RP- 8 hedges on common levels forhigh mast and conventional lightingnoting that “opinions differ”

l RP- 8 allows the illuminance designmethod for all other roadway lighting,so high mast is no different


l Apply common levels forconventional and high mast lighting

l Require the pavement luminancedesign method for both conventionaland high mast lighting



Handoutsare

Available

Documents

Lighting Design Impacts of IES RP- 8 Changesconferences.illinois.edu/the/webpdf/ANDERSON.pdf · Lighting Design Impacts of IES RP- 8 Changes Marty Anderson Bureau Chief, IDOT District