RESTRICTION OF TURNING MOVEMENTS
The Traffic Engineer is authorized to determine specific intersections at which the operators of vehicles shall not make a right turn, left turn, U-turn, or a right turn against a red or stop signal, and shall place proper signs and/or markings giving notice thereof.
- Raised medians are often considered as an effective technique to restrict turning movement.
- They also provide the added benefit of corridor aesthetics.
- Turn restriction alternatives effectively address the safety and operational needs of the transportation network.
- Turn restrictions may be located at:
- Access point
- Roadway and
- Combined restriction configurations
- The goal of imposing restriction of turning movements is to save lives by identifying new safety strategies that effectively reduce crashes and to promote those strategies for nationwide implementation by providing measures of their safety effectiveness and benefit–cost (B/C) ratios.
- The restriction has been imposed by using physical barriers.
- Turning movement restrictions are a type of access management strategy used to improve the safety of stop-controlled intersections and driveways.
- Restricted and prohibited turn movements reduce the number of turning conflict points at intersections, which are generally known to reduce crash risk.
- The median physically blocks turns into and out of the intersecting street.
- While restricting turns is expected to provide a safety improvement in most cases, limited information is available about the quantitative safety effects of these practices and their effects on downstream intersections.
- A composite finding suggested that, in general, a raised median is safer than undivided roadways, especially on roads with more than 20,000 vehicles per day.