Institute of Transportation Engineers





Transoft Solutions


Traffic Calming Measures - Speed Table


Description:

  • long raised speed humps with a flat section in the middle and ramps on the ends; sometimes constructed with brick or other textured materials on the flat section
  • sometimes called flat top speed humps, trapezoidal humps, speed platforms, raised crosswalks, or raised crossings

Applications:

  • local and collector streets
  • main roads through small communities
  • typically long enough for the entire wheelbase of a passenger car to rest on top
  • work well in combination with textured crosswalks, curb extensions, and curb radius reductions
  • can include a crosswalk
Speed Table
Speed Table Schematic Design/Installation Issues:
  • typically 22 feet in the direction of travel with 6 foot ramps on each end and a 10 foot flat section in the middle; other lengths (32 and 48 feet) reported in U.S. practice
  • most common height is between 3 and 4 inches (and reported as high as 6 inches)
  • ramps are typically 6 feet long (reported up to 10 feet long) and are either parabolic or linear
  • careful design is needed for drainage

Potential Impacts:

  • no effect on access
  • speeds are reduced, but usually to a higher crossing speed than at speed humps (typically between 25 and 27 miles per hour)
  • traffic volumes have been reduced on average by 12 percent depending on alternative routes available
  • collisions have been reduced on average by 45 percent on treated streets (not adjusted for traffic diversion)
  • reported to increase pedestrian visibility and likelihood that driver yields to pedestrian

Emergency Response Issues:

  • typically preferred by fire departments over 12 to 14-foot speed humps
  • generally less than 3 seconds of delay per hump for fire trucks

Typical Cost:

  • approximately $2,500 (in 1997 dollars) for asphalt tables; higher for brickwork, stamped asphalt, concrete ramps and other enhancements sometimes used at pedestrian crossings







DOT Logo

Ite Logo

1627 I ("Eye") Street, NW, Suite 600
Washington, DC
20006-3538 USA
Phone: 202-785-0060
Fax: 202-785-0609
Send comments to:
ite_staff@ite.org

SPEED HUMP | SPEED TABLE | RAISED INTERSECTION | CLOSURE | NEIGHBORHOOD TRAFFIC CIRCLE | CHICANE | CHOKER | CENTER ISLAND NARROWING


Institute of Transportation Engineers
1627 Eye Street, NW, Suite 600 | Washington, DC 20006 USA
Telephone: +1 202-785-0060 | Fax: +1 202-785-0609
ite_staff@ite.org

Facebook Twitter LinkedIn YouTube Google+ Instagram Pintrest

ITE Canon of Ethics
2014 Institute of Transportation Engineers