Fourth, there are no vehicle wheel stops in the ADA parking spaces to prevent parked vehicles from obstructing the required space of the shared aisle. Standard 502.7, Relationship to Accessible Routes, states, “Parking spaces and access aisles shall be designed so that cars and vans, when parked, cannot obstruct the required clear width of adjacent accessible routes.” Advisory 502.7, Relationship to Accessible Routes, states, "Wheel stops are an effective way to prevent vehicle overhangs from reducing the clear width of accessible routes." See the photo below for an example of a wheel stop.