ADAAG Manual

Islands [4.7.11]

At traffic islands, wheelchair space between opposing ramps is essential. If there is no level space between ramps, wheelchairs can "bottom out" or "high center" while proceeding down one ramp while the back wheels are coming up the other slope. Cut-through routes level with the street are necessary where wheelchair space between opposing ramps is not available. Islands with cut-through routes must be wide enough (48 inches minimum) to provide space for a person using a wheelchair.