Speed Tables and Raised Crosswalks Source: Google Earth, Lexington, KY DEFINITION AND DESCRIPTION A speed table is a raised area installed across the roadway to limit vehicle speeds. It extends across the roadway and has a flat top sufficiently long (typically, 10...
Raised Intersections Image Source: NACTO DEFINITION AND DESCRIPTION A raised intersection functions like a speed table but extends across the full width of the intersection.. Ramps are installed on each approach, and the intersection elevation is flush with the...
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...
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...
