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....
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...
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...
Rectangular Rapid Flashing Beacon (RRFB) DEFINITION AND DESCRIPTION Rectangular Rapid Flashing Beacons (RRFBs) are used to provide emphasis to warning signs at marked crosswalks across uncontrolled approaches. RRFBs consist of two rectangular-shaped yellow...
Protected Intersection Image Source: FHWA DEFINITION AND DESCRIPTION Protected intersections use a setback or offset design to minimize conflict points and improve visibility between drivers, pedestrians, and/or bicyclists. Features of protected intersections include...
Positive Offset Turn Lanes Image Source: FHWA DEFINITION AND DESCRIPTION The typical geometry and operation of signalized intersections can present several challenges. Sight distance is important for drivers to identify acceptable gaps in opposing traffic. Opposing...
