Skip to main content

Neighborhood Traffic Management Program (NTMP)

Tools to Address Traffic Volumes

Turn Prohibition Signs

Different prohibition and restriction signs

Turn restrictions prohibit movements at designated intersections - often during specified peak hours. Full-time turn restrictions are not as effective. Compliance is a problem with un-enforced turn-restrictions with about 50% violation. Enforced restrictions have about 20% violations rates. (Source: Traffic Calming: State of the Practice - ITE, 1999)

Like one-way streets, turn restrictions can result in inconvenience to residents by making access to some properties indirect, and they may also affect emergency response times. However, they can be used effectively to control cut-through traffic.


Temporary Installation

Restriction sign permanent installation

Permanent Installation


  • Can be used to prevent cut-through traffic.
  • Relatively low cost option.
  • Most effective if limited to peak hours.


  • May cause inconvenience for residents and emergency response.
  • May have enforcement problems.
  • Work better with active enforcement.
  • May affect adjacent streets and intersections.
Summary of Effectiveness
Volume Reduction Yes
Speed Reduction No
Safety Improvement Unknown
Streets to Use On Collector, Local Local/Collector
Use on Bus Route Yes
Use with Curbs and Gutters Yes
Spot or Area-wide Use Area
Emergency Service Access Issues Yes
Impacts on Arterials Possible
Change in % Truck Unknown
Environmental Changes No
Dependence on enforcement Same
Level of Violation 20-50%
Aesthetics and Landscaping No