TRBas National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.The Manual on Uniform Traffic Control Devices (MUTCD) provides the basic principles that govern the design and ... Regulatory signs inform of traffic laws or regulations, warning signs give notice of a situation that might not be readily ... users need to detect signs and comprehend the message content in a timely manner in both daytime and nighttime. ... Light from a vehiclea#39;s headlamps is reflected from the signa#39;s surface back to the driver giving the sign an illuminated appearance.
|Title||:||Practices to Manage Traffic Sign Retroreflectivity|
|Author||:||Jonathan M. Re, Paul John Carlson|
|Publisher||:||Transportation Research Board - 2012-01-01|