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Color contrast requirement for ADA detectable warning surfaces

Color contrast requirement for ADA detectable warning surfaces

(OP)
I'm working on crosswalks for intersections between HMA shared use paths and HMA roadways. We prefer the cast iron detectable warning surfaces for durability reasons, but when weathered, they will not have the required contrast against the HMA. They do sell powder-coated ones, but the first time a snowplow driver swings a bit wide, the wing plow will scrape the color off all the truncated domes. Both Neenah Foundry and E J Co recommend the natural finish.

Given that the cast iron DWSs have to be set into PCC anyway, I could make the slab large enough to provide a white border around the dark iron. My question is, how large would this border need to be?

I've sent an inquiry to the Access Board's technical assistance office, but I haven't received an answer yet.

RE: Color contrast requirement for ADA detectable warning surfaces

My thought would be 4 to 6 inches wide. This is in keeping with parking delineation stripes and other pavement markings.

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