Speed Humps

Speed Tables

Raised Crosswalks

Raised Intersections

Traffic Circles

Roundabouts

Medians

Curb Extensions

Deflector Islands

Diverters

 
Traffic Calming Devices → Vertical Speed Control Devices
   
Speed Tables  
   
What are Speed Tables?
  • Flat-topped raised areas of pavement across the lane of travel.
  • Typically less jarring than speed humps.
  • Designed to allow vehicles to traverse them safely.
  • Designed to encourage vehicles to proceed at or below the posted speed limit.
 


 




 

 

 How are Speed Tables designed?
  • The most popular speed table is 7 meters in the direction of travel. Which includes 2 meter ramps on each side and a 3 meter flat top. The table is typically 80 millimeters high.
  • Generally, the flat top of the speed table is long enough to fit the entire wheelbase of a car.
  • The design speed is usually around 40 to 50 km/h.
  • Designs for speed tables with other dimensions exist. The dimensions of a speed hump best suited for a particular application are determined by desired design speed, wheel base of the design vehicle, and other specific design criteria.
 
Where are Speed Tables placed and how much are they?
  • Speed tables are usually used at mid-block locations.
  • Ideal for residential applications and crosswalk applications.
  • The installation cost of a speed table is between $1,500 and $5,000. The cost can be much higher when drainage, stamped asphalt, concrete ramps, and other features are added. With added features the cost can approach $10,000 per speed table.

 


 
Advantages
Disadvantages
  • Effective in reducing vehicle speed
  • Not as jarring to vehicles as speed humps
  • Can be employed on higher volume/speed roads
  • More expensive than speed humps
  • Potential slight increase in road noise after installation

 
Speed Table Issues & Comments
  • Fire trucks experience an approximate delay similar to that of a speed hump, 3 to 5 seconds per hump. The 7 meter table design seems to create slightly shorter delays than the 3 meter speed hump.
  • To attract attention and improve appearance the flat tops of speed tables are typically constructed with brick or other textured materials. This can attract attention to them and improve the appearance and possibly performance.
  • The ramps can be constructed of concrete or asphalt.
  • Some fire departments prefer speed tables over speed humps as they appear to work better on roads that require higher volume and speed, and speed tables can be used as crosswalks where appropriate.
  • The aesthetics of the speed table should be considered in the design.