Description:

• flat raised areas covering entire intersections, with ramps on all approaches and often with brick or other textured materials on the flat section and ramps
• sometimes called raised junctions, intersection humps, or plateaus

Applications:

• work well with curb extensions and textured crosswalks
• often part of an area wide traffic calming scheme involving both intersecting streets
• in densely developed urban areas where loss of parking would be unacceptable

	Design/Installation Issues: typically rise to sidewalk level may require bollards to define edge of roadway Canadian installations typically have gentle 1:40 slopes on ramps storm drainage modifications are necessary

Potential Impacts:

• reduction in through movement speeds at intersection
• reduction in midblock speeds typically less than 10 percent
• no effect on access
• make entire intersections more pedestrian-friendly
• no data available on volume or safety impacts

Emergency Response Issues:

• slows emergency vehicles to approximately 15 miles per hour

Typical Cost:

• reported costs range between $15,000 and $50,000 (1997 dollars)

1627 I ("Eye") Street, NW, Suite 600
Washington, DC
20006 USA
Phone: 202-785-0060
Fax: 202-785-0609
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SPEED HUMP | SPEED TABLE | RAISED INTERSECTION | CLOSURE | NEIGHBORHOOD TRAFFIC CIRCLE | CHICANE | CHOKER | CENTER ISLAND NARROWING