This report provides guidance for the design and application of shoulder and centerline rumble strips as an effective crash reduction measure, while minimizing

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 339: Centerline Rumble Strips (CLRS) examines current design, installation, configuration,

Concludes that although adequate sleep is the only 100 percent effective "countermeasure" for sleepiness, there are other countermeasures to help make driving s