Accessible parking is one of the cheapest parts of the ADA to get right and one of the most frequently violated. The actual rule set is short and the math is not subtle — but striping contractors do not always read the 2010 Standards before they pick up a paint gun. Here are the five failures that turn up again and again.
1. Not enough accessible spaces
The 2010 Standards require a minimum number of accessible spaces as a function of total parking in a lot. The ratio is clear — §208.2 has the table — but operators often count bulk employee lots and separate customer lots together and come up short on the customer side.
Quick rule of thumb: 1 to 25 spaces total requires at least 1 accessible space. 26 to 50 requires 2. 51 to 75 requires 3. At 76 to 100, you need 4. The ratio tapers as total spaces go up but never falls below 2% of total capacity.
2. The van-accessible space is missing or undersized
One in every six accessible spaces must be van-accessible. A van-accessible space needs a parking stall at least 96 inches wide plus an access aisle at least 96 inches wide — or, alternatively, a 132-inch stall with a 60-inch access aisle. Either configuration is acceptable; confusing the two and striping a 96-inch stall with a 60-inch aisle is not.
The vertical clearance at the van-accessible space — and along the vehicular route to and from it — must be at least 98 inches (8’2″). Low-clearance parking structures frequently fail this without noticing.
3. The access aisle is too narrow, or it’s been paved over
A standard accessible space (not van-accessible) requires a 96-inch stall and a 60-inch access aisle. Two accessible spaces can share one access aisle between them, which is fine, but it has to actually be striped as an aisle — not just the gap between two stall lines — and it must connect without stepping off a curb to the accessible route into the building.
Access aisles must be marked diagonally or cross-hatched so they are visibly not parking spaces. Cars get parked in unmarked aisles every day. That’s a striping failure, not a driver failure.
4. The slope exceeds 1:48 in any direction
Accessible parking spaces, access aisles, and the accessible route connecting them cannot slope more than 1:48 — that’s approximately 2.08% grade, or 1.19°. This sounds generous, and in flat parking lots it is. In hillside lots or lots paved on a natural grade, it is routinely violated. A 3% cross-slope is not a rounding error; it is a non-compliant parking space.
Measure with a two-foot digital angle meter placed parallel and perpendicular to the stall lines, at the head, middle, and foot of the space. The steepest reading is the one you use.
5. The signage is missing, wrong, or too low
Every accessible space must be identified by a sign displaying the International Symbol of Accessibility (ISA) — not the painted-on ground symbol alone; the painted symbol is common, helpful, and does not substitute for the sign. Van-accessible spaces require the word “Van Accessible” in addition to the ISA.
Sign height: the bottom of the sign must be at least 60 inches (5 feet) above the ground surface so it remains visible when a car is parked in front of it. Signs mounted at 42 inches — the standard utility-pole parking sign height — are below the ADA minimum and regularly fail.
Verify before you file
If you’re documenting a parking-lot violation, photograph the lot’s layout wide, measure the stall width and aisle width with a tape, measure the slope in both directions with an angle meter, and photograph the sign face-on from the same height as a seated driver would see it. Then fill out the Report a Violation form and select “Parking” as the category.