Traffic Operational Impacts of Transverse, Centerline, and Edgeline Rumble Strips

This report documents the findings of a 30-month project in which various rumble strip applications were tested. The focus was on the operational aspects of in-lane, transverse rumble strips (TRSs) and centerline rumble strips (CRSs). Operational aspects of edge line rumble strips (ERSs) were also tested. The researchers reviewed previous studies, interviewed state agencies with significant rumble strip experience, and reviewed available policies. Based on these efforts and input by the Texas Department of Transportation (TxDOT), the researchers then developed initial application guidelines for rumble strips in Texas. The TRSs were evaluated at stop-controlled intersections and horizontal curve locations throughout the state. Passing operations and vehicle lateral position were evaluated as a function of milled and raised CRSs at sites throughout the state. Shoulder usage was evaluated as a function of milled ERSs. Researchers used the results of the operational studies, TxDOT input, and the synthesis of previous studies and other state policies to develop recommendations for TxDOT for TRSs, CRSs, and ERSs. These recommendations are contained in Appendix C.