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Selection and Application of Warning Lights on Roadway Operations Equipment (2008) / Chapter Skim
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Summary
Pages 1-4

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From page 1...
... This research project was undertaken to evaluate the effectiveness of warning lights on roadway maintenance vehicles with the goal of establishing guidelines for the application of the lighting system on the vehicle. The research included an evaluation of the lighting parameters that define the performance in terms of glare and vehicle detectability as well as an evaluation of the lighting systems in adverse weather and in a dynamic setting.
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From page 2...
... The potential for glare is the primary consideration when specifying requirements for warning lights that will be used during nighttime. Bright warning lights and oppressive flashing will provide disability glare and discomfort for a driver of an oncoming vehicle or a vehicle passing a maintenance vehicle from behind.
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From page 3...
... 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 4...
... Steady lights have many other vehicle uses, such as clearance indicators, brake lights, and vehicle headlights, and thus they should not be used to warn drivers of the presence of maintenance vehicles. Lighting Layout and Positioning In the layout of the vehicle lighting, positioning the lighting such that it appears against a portion of the vehicle and not against the sky will provide a consistent contrast and will allow for increased daytime and nighttime conspicuity.
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Key Terms

  • light source
  • warning lights
  • light sources
  • maintenance vehicle
  • maintenance vehicles

  • vehicle identification
  • adverse weather
  • lower effective
  • flash pattern
  • warning light

  • light seen
  • vehicle safety
  • roadway operations
  • visually complex
  • flash durations

  • operations equipment
  • adequate daytime
  • tail lights
  • daytime conspicuity
  • light type

  • led light
  • calculating effective
  • amber light
  • total light
  • light output

  • overall effective
  • white light
  • maximum effective
  • maintenance crew
  • roadway maintenance


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