Transverse Pavement Rumbles Source: Google Earth, Frankfort, KY DEFINITION AND DESCRIPTION Transverse rumble strips are placed in travel lanes perpendicular to the direction of travel. The noise tires make when they contact the rumbles alert motorists to slow down....
Superelevation Improvement Image Source: Google Earth DEFINITION AND DESCRIPTION Superelevation promotes motorist comfort as they accelerate a vehicle through a curve. Superelevation may be inadequate due to long-term deterioration from settlement or pavement...
Speed Reduction Markings Image Source: Google Earth DEFINITION AND DESCRIPTION Speed Reduction Markings, or optical speed bars (OSBs), are white transverse pavement markings placed on both sides of a lane perpendicular to the centerline, edge line, or lane line with...
Speed Feedback and Changeable Message Signs DEFINITION AND DESCRIPTION Dynamic speed feedback signs contain devices that measure the speed of an approaching vehicle and displays the speed to the vehicle operator. They are used to provide warning to drivers of their...
Slope Flattening DEFINITION AND DESCRIPTION Slope flattening reduces the steepness of the roadside and median slopes so that errant motorists are more likely to keep their vehicles stable, regain control, and avoid obstacles. Slopes of 4H:1V or flatter are recoverable...
Sequential Dynamic Chevron Warning System Image Source: Iowa State University Center for Transportation Research and Education DEFINITION AND DESCRIPTION A sequential dynamic curve warning system (SDCWS) consists of a series of solar-powered LED chevron signs...
