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Neighborhood Traffic Management Program (NTMP)

Tools to Address Speeding

22' Table

Design of the speed table

Tops can be paved for a more attractive look but this increases the cost.

Speed table Sign

Example of Speed Table Sign

These are basically flat-topped speed humps. If marked for pedestrian crosswalks they become Raised Crosswalks. The most common is the 22-foot design used by Seminole County FL. The ramps on the end are 6 feet long and the platform is 12 feet long. They have an 85th percentile speed of 25 to 30 mph and present less of a "bump" to drivers.

They have been used in Florida on roads with volumes up to 6,000 vehicles per day and are often used instead of speed humps. They can be preferred by emergency response agencies.

Also known as Trapezoidal Humps and Speed Platforms.

Temporary installation of a speed table

Temporary Installation

Permanent installation of a speed table

Permanent Installation

PROS

  • Reduces traffic speed to 25-30 mph.
  • Less impact than speed humps.
  • Preferred by many emergency response agencies.
  • Often used in place of speed humps.
  • Relatively low cost measure.

CONS

  • May impact emergency vehicles.
  • Care needed if placed on transit routes.
  • Not aesthetically pleasing though paving the top is an option.
  • Avoid use on curved roads.
  • Noise may increase.
  • Care needed with drainage.
  • Avoid placing near driveway.
  • Need detectable ADA warnings.
Summary of Effectiveness
Volume Reduction Unknown
Speed Reduction Yes
Safety Improvement Possible
Streets to Use On Collector, Local Local/Collector
Use on Bus Route Yes
Use with Curbs and Gutters Yes
Spot or Area-wide Use Spot
Emergency Service Access Issues Less than Humps
Impacts on Arterials Possible
Change in % Truck Unknown
Environmental Changes Unknown
Dependence on enforcement No
Level of Violation Self-enforced
Aesthetics and Landscaping Can be Paved