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Selection and Application of Warning Lights on Roadway Operations Equipment (2008) / Chapter Skim
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Attachment - Proposed Guidelines for the Selection and Application of Warning Lights on Roadway Operations Equipment
Pages 35-39

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From page 35...
... Maintenance Vehicle and Crew The safety of the maintenance-vehicle crew also has two conditions to be considered: when the maintenance crew is in the vehicle and when one or more crew members is outside of the vehicle, possibly working on the road. A T T A C H M E N T Proposed Guidelines for the Selection and Application of Warning Lights on Roadway Operations Equipment
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From page 36...
... A high-effective-intensity light source limited the ability of an approaching driver to see the pedestrian standing behind the maintenance vehicle. Glare and pedestrian detection also limit the maximum effective intensity of the warning-light system and limit the number and type of light sources placed on the maintenance vehicle.
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From page 37...
... Many of the visual effects of the low- and high-mounted beacons can be achieved using LED light sources. Signal Colors It is recommended that only amber lighting and white lighting be used in maintenance vehicles, with amber being the predominant color.
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From page 38...
... were developed in a screening experiment based on the Form Factor method and then verified by the performance experiment. These values represent the total light output limits for the warning-light system on each of the approach sides of the vehicle (i.e., these limits apply to the sum of the output from the lighting on each of the rear, sides, and front of the vehicle)
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From page 39...
... 2. Multiple light sources should be provided such that the outline of the vehicle is visible, including any obstacle attached to the vehicle such as a blade or a trailer.
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Key Terms

  • light source
  • maintenance vehicle
  • light sources
  • warning lights
  • rotating beacon

  • form factor
  • factor method
  • vehicle identification
  • vehicle color
  • roadway operations

  • flash pattern
  • visually complex
  • lower effective
  • maintenance vehicles
  • complex environments

  • operations equipment
  • adverse weather
  • intensity light
  • led light
  • light output

  • vehicle lighting
  • maximum effective
  • double flash
  • flash durations
  • adequate daytime

  • provide increased
  • beacon provides
  • daytime conspicuity
  • maximum value
  • proposed guidelines


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