RESEARCH PAYS OFF: RUMBLE STRIPS: FINDING A DESIGN FOR BICYCLES AND MOTOR VEHICLES

The Pennsylvania Department of Transportation (PennDOT) researched milled rumble strip patterns that are safe and effective for bicyclists as well as motorists on nonfreeway roads. This was a difficult task because the needs of each group differ. Bicyclists want to cross the rumble strip safely and comfortably with minimal vibration, while motorists want sufficient vibration and sound to warn that the vehicle is drifting from the travel lane. Six rumble strip configurations were tested and rated. Two patterns were chosen and will be installed on nonfreeway routes across Pennsylvania this year. The goal is to reduce run-off-the-road crashes and fatalities on nonfreeway facilities, while at the same time improving bicyclist safety.