Research Click on the links below to view research on various forms of traffic calming. Road Diet Studies Roadway Obstacles StudiesDriver Behavior StudiesGeneral Resources:FHWA Traffic Calming ePrimer WebsiteFHWA CMF ClearinghouseFHWA Speed Reduction CountermeasuresUtah DOT Speed Management StudiesOregon DOT Crash Reduction Factor ManualVermont DOT Traffic Calming ToolkitCalifornia DOT Traffic Calming Guide