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...
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...
