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200-340-010  <<  200-340-020 >>   200-340-030

PDFWAC 200-340-020

Design standards.

The following construction standards are applicable to all curb-ramps set forth in this chapter.
(1) The width of the center ramps shall be at least thirty-six inches.
(2) Shoulder slopes shall not exceed one inch in 6.
(3) The center ramp slope shall not exceed 1 in 12 and the cross slope shall not exceed 1 in 50.
(4) Curb ramps should contain a slip-resistant surface.
(5) The site of the curb ramp should be graded and drained to eliminate pooling of water or the accumulation of ice or water on the ramp, the ramp landing, or at the toe of the ramp.
(6) Handrails shall not be used at any point of access along the curb ramp.
(7) Curb ramps should be outside of the main pedestrian path.
(8) Whenever curb ramps are placed in the main flow of pedestrian traffic, the following standards prevail:
(a) Align with the direction of pedestrian traffic.
(b) Advance warning system.
(9) The curb ramp should be distinguished from surrounding surfaces either by color or texture.
(10) There should be no abrupt change in elevation to exceed 1/2 inch.
(11) A landing 5 feet x 5 feet should be located at top and bottom of every curb ramp.
[Statutory Authority: 2011 c 43. WSR 11-23-093, recodified as § 200-340-020, filed 11/17/11, effective 11/17/11. Statutory Authority: RCW 35.68.076. WSR 78-02-066 (Order 77-5), § 236-60-020, filed 1/24/78.]
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