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...
Roadway Narrowing: Pavement Markings Image Source: FHWA DEFINITION AND DESCRIPTION Roadway narrowing is often done as part of resurfacing or roadway improvement projects. It may include repurposing additional paved space with markings or physically removing unused...
Curb Extensions Image Source: Google Earth, Paducah DEFINITION AND DESCRIPTION A curb extension is a horizontal extension of the sidewalk into the street that results in a narrower roadway section. They may be placed at intersection corners or mid-block. A curb...
Rest in Red DEFINITION AND DESCRIPTION Under ‘Rest-In-Red’ (RIR) traffic signal operation, a traffic signal remains red in all directions until a green phase is triggered by a motorist or pedestrian. It is an effective, low-cost speed management tool under certain...
