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Neighborhood Traffic Management Program (NTMP)

Tools to Address Traffic Volumes

One Way Streets & Signs

Different one-way signs

One-way Streets and associated signs are used to restrict all through traffic in a given direction on particular streets. When used on a series of streets they can be effectively used to prevent cut-through traffic.

One-way couplets or pairs of one-way streets going in two directions are not usually used for traffic calming because they often cause an increase in traffic speed. All one-way streets have the potential to increase travel speed and they may need to be used in conjunction with other speed control devices to offset this. It is important to obtain resident input in any plan to implement one-way streets because access routes to properties on or near the streets can be affected.


Temporary Installation

San Marino, CA

One-way sign permanent installation

Permanent Installation


  • Simplify crossing for pedestrians.
  • Can be used to prevent cut-through traffic.
  • May provide room for a bike lane.
  • May allow more on-street parking to be added.


  • May increase travel speeds.
  • May cause inconvenience for residents and emergency response.
  • Best used with other speed reduction measures.
  • May affect adjacent streets and intersections.
  • Generally disliked by residents.
Summary of Effectiveness
Volume Reduction Possible
Speed Reduction No
Safety Improvement For Peds
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 Poss > Noise
Dependence on enforcement Some
Level of Violation Unknown
Aesthetics and Landscaping Possible