Meeting the intent of ADA in sidewalk cross-slope design.

摘要: Recent work has indicated that prior research is insufficient to support the ADA Accessibility Guidelines' (ADAAG) 2% maximum cross-slope requirement for sidewalks. In addition, present ADAAG are inflexible in they do not consider deviations from this short sections of sidewalk, such as at driveway crossings, which can be significant concern state and local departments transportation. Based upon these findings, a study was undertaken evaluate usable range sidewalk cross-slopes by explicitly considering user perception effort. Twenty subjects ranging widely age type mobility aid participated field surveys where traversed different varying cross-slope, primary grade, length, width, other characteristics. This paper illustrates use weighted-least-squares ordered-probit regression models analysis disabled-user response The results permit estimation consistent with intent spirit ADA. These estimated 4%--where feasible-and 10%--where unfavorable construction conditions exist. Such should prove useful consideration final requirements on topic. However, larger sample sizes stronger recognition population interest necessary before definitive, legislated maxima ascertained.