Research: Roadway Signals and Signage

The links below describe some of the LRC's research in roadway signs and signals.
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Traffic Signals

• Effect of Rise Time on Traffic Signal Visibility
• Are Yellow Traffic Signals Brighter Than They Need to Be?
• Signaling the Future
• Will LEDs Transform Traffic Signals as They Did Exit Signs?
• Increasing Market Penetration of LED Traffic Signals in New York State: Review of Articles and Information on LED Traffic Signals
• Luminous Intensity for Traffic Signals: A Scientific Basis for Performance Specifications (with appendix)
• Survey of California Municipalities about LED Traffic Signals
• LED and Traffic Signal Technology
• Issues and Options Paper - LED Traffic Signals
• LED Traffic Signals Roundtable Meeting
• Information about Traffic Signal Specifications Available on the World Wide Web
• Survey of Local Agencies About LED Traffic Signals

Pedestrian Signals

• Evaluation of In-Pavement, Flashing Warning Lights on Pedestrian Crosswalk Safety
• Pedestrian Crosswalk Safety: Evaluating In-Pavement, Flashing Warning Lights

Signage

• Luminance Requirements for Lighted Signage
• Evaluation of LED Channel-Letter Signage
• The Significance of Surround Conditions for Roadway Signs