Two-Way Left Turn Lane (TWLTL) Restrictions DEFINITION AND DESCRIPTION Two-way left-turn lanes (TWLTLs) enhance safety and traffic flow at locations with moderate traffic volumes and moderate to high access point densities. They are typically installed when access...
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...
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...
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...
Supplemental In-Lane Pavement Markings Image Source: Julian, F. Horizontal Signing, A Proven Low-Cost Horizontal Curve Safety Countermeasure.2024 TRB International Roadside Safety Conference presentation. DEFINITION AND DESCRIPTION Regulatory, warning, or guidance...
