Prototype mobile luminance measurement system and level of service for evaluating rural high-speed nighttime delineation.
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2013-02-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;NTL-OPERATIONS AND TRAFFIC CONTROLS-Traffic Control Devices;NTL-SAFETY AND SECURITY-Highway Safety;
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Abstract:Transportation agencies routinely travel their extensive roadway networks conducting subjective roadway
assessments of traffic control devices both day and night. Retroreflectivity is a good tool for product testing
but can provide false positives for traffic control devices based on the approach geometry. This research
project developed an objective nighttime assessment method for traffic devices that could be tied back to a
form of level of service. The project also correlated luminance data with level of service. Researchers
recommend the use the precise and approximate measurement methods in conjunction with nighttime
inspections and retroreflectivity measurements to assess the accuracy and repeatability versus time.
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