Accessible Sidewalks and Curb Ramps

An Update

According to ADA Accessibility Guidelines (ADAAG) all newly constructed or reconstructed sidewalks must have a 24-inch wide strip of raised truncated domes at the bottom of all curb ramps. (See Road Business, Summer 2004). In 2002, the New Hampshire Department of Transportation (NHDOT) began research on detectable warning devices for sidewalks. Concerned about the harsh winter conditions of New Hampshire, the research tested how well the domes survive sidewalk plows.

After the first winter, researchers recommended two products. The products wore well and complied with ADAAG, but even the best performer had failed, after the third winter.

Since their initial research many other truncated dome products are available. The NHDOT has new specifications recommending a cast iron product that uses materials similar to a man-hole cover. NHDOT staff notes that the cast iron product will rust but foresees no other deficiencies.

The City of Manchester uses truncated domes throughout the city, particularly in the downtown area. Kevin Sheppard, Deputy Director of Public Works, says “In the beginning we were concerned with winter maintenance and how the domes would survive. We have had a good experience with our installations.”

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