Parking and Highway Improvement (C-32) · Lesson 2 of 7

Accessible Stall Layout, Slope and Markings

"Accessible Stall Layout, Slope and Markings" is lesson 2 of 7 in the Parking and Highway Improvement (C-32) Learning Hub. It opens with "Measure From the Centerline of the Paint" and works through 5 short steps, then a worked example you can check yourself against.

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Steps in this lesson

  1. Measure From the Centerline of the Paint
  2. Stall and Aisle Sizes
  3. Surface, Slope and Headroom
  4. Pavement Markings
  5. Signs and Wheel Stops

The worked example in the course applies this lesson to a realistic job in 5 steps, from "List the minimums" through "Check the slope limit".

What you'll be able to do

  • Explain the main idea of "Accessible Stall Layout, Slope and Markings" in plain language you can use on the exam.
  • Apply this step with confidence: "Surface, Slope and Headroom".
  • Apply this step with confidence: "Pavement Markings".
  • Apply this step with confidence: "Signs and Wheel Stops".
  • Test yourself on the worked example and the quick-check quiz inside the classroom.
Accessible Stall Group: Van + Shared Aisle + CarNO PARKINGISAISAVAN144 in wideCAR108 in wide14460108216 in long312 in = 26 ft 0 inWORKED EXAMPLE (CBC 11B-502)Van stall (aisle on passenger side)144 inShared access aisle60 inCar stall108 in144 + 60 + 108 = 312 in= 26 ft 0 in, line centerline to centerlineException: 108 van + 96 aisle + 108 car= 312 in, same overall widthSlope limit 1:48 in any direction216 in / 48 = 4.5 in max drop on stall60 in / 48 = 1.25 in max drop on aisleVertical clearance 98 in minimumGroup is 26 ft wide x 18 ft long; no change in level, slope 1:48 or lessBlue border, hatching at 36 in max on center, NO PARKING letters 12 in high2025 CBC 11B-502.1 to 11B-502.5 (widths measured from marking centerlines)CC
The diagram for this lesson, exactly as it appears in the Learning Hub.

The first steps of this lesson

Step 1: Measure From the Centerline of the Paint

2025 California Building Code (CBC) Section 11B-502.1 says that where spaces are marked with lines, widths of parking spaces and access aisles are measured from the centerline of the markings. If a space or aisle is not next to another space or aisle, the measurement may include the full width of the line. A 4-inch line therefore eats 2 inches of each neighboring stall, so layout from the centerlines, not from the edge of the paint.

Step 2: Stall and Aisle Sizes

Section 11B-502.2 sets car and van spaces at 216 inches (18 ft) long minimum, car spaces 108 inches (9 ft) wide minimum, and van spaces 144 inches (12 ft) wide minimum. The exception lets a van space be 108 inches wide if its access aisle is 96 inches wide. Section 11B-502.3 requires every space to have an adjacent access aisle at least 60 inches wide that runs the full length of the stall. Two spaces may share one aisle, and van aisles go on the passenger side (11B-502.3.4).

The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.

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