An accessible route is the connective tissue of an accessible building. Compliant parking spaces, restrooms, and entrances mean nothing if the path connecting them fails. Under the 2010 ADA Standards for Accessible Design, an accessible route must link all accessible building elements, spaces, and site arrival points into a continuous, navigable path for individuals using wheelchairs, walkers, crutches, or other mobility devices.
For inspectors and accessibility professionals, verifying accessible route compliance is one of the most demanding parts of a site survey precisely because it requires evaluating every component along an entire path, not just individual elements in isolation.
This guide covers every technical requirement an inspector must verify, including width, running slope, cross slope, surface conditions, changes in level, door specifications, curb ramps, and the common failure modes that show up in real-world inspections.
Key Takeaways
- At least one accessible route must connect all accessible spaces and elements, including parking, entrances, and interior destinations.
- Walking surface running slope must not exceed 1:20 (5%). Any portion steeper than 1:20 must be treated as a ramp and meet ramp requirements.
- Cross slope of walking surfaces must not exceed 1:48 (2.08%).
- Minimum clear width for an accessible route is 36 inches, with 60-inch passing spaces required where width is restricted.
- Changes in level greater than 1/2 inch require a ramp, curb ramp, elevator, or platform lift.
- Accessible routes must have 80 inches of vertical clearance throughout their length.
What Is an Accessible Route and When Is One Required?
An accessible route is a continuous, unobstructed path connecting accessible elements and spaces of a building or facility. Under ADA Section 206, at least one accessible route must be provided from each of the following site arrival points: accessible parking spaces and passenger loading zones, public streets and sidewalks, public transportation stops, and accessible building entrances.
Within the interior, at least one accessible route must connect all accessible spaces and elements. If a building’s circulation path is interior, the accessible route must also be interior. Vertical circulation routes must be in the same area as stairs and escalators, not isolated in a service corridor or back area.
For multi-story facilities, an accessible route between stories is generally required. Exceptions exist for private-sector facilities under 3 stories or with less than 3,000 square feet per story that are not shopping centers, professional offices of healthcare providers, terminals, or stations. Government facilities subject to ADA Title II typically must provide vertical access between stories regardless of size.
Walking Surface Requirements
Width
The minimum clear width of an accessible route is 36 inches. This is an absolute floor. Where a route is less than 60 inches wide, passing spaces at least 60 by 60 inches must be provided at intervals not exceeding 200 feet to allow two wheelchair users to pass each other. Routes that are 60 inches or wider throughout their length do not require separate passing spaces.
Protruding objects can reduce the effective clear width of a route. Wall-mounted objects, signage, or equipment that protrudes more than 4 inches into the circulation path at heights between 27 and 80 inches above the floor reduces the usable width. Inspectors must verify not just the base width of a corridor or walkway but the effective clear width at any protruding element.
Running Slope
The maximum running slope for a walking surface that is part of an accessible route is 1:20, or 5 percent. Any portion of a route with a running slope steeper than 1:20 is classified as a ramp under the ADA and must comply with all ramp requirements, including the 1:12 maximum slope, edge protection, handrails for any rise over 6 inches, and level landings at top and bottom.
Inspectors should measure running slope in the direction of pedestrian travel using a digital level or slope gauge. A 24-inch level with a tape measure can also be used: the gap between the end of the level and the surface should not exceed 1.2 inches for a surface to comply with the 1:20 maximum. Any measurement exceeding that threshold indicates a slope deficiency.
Cross Slope
Cross slope, measured perpendicular to the direction of pedestrian travel, must not exceed 1:48 on accessible route walking surfaces. This is a 2.08 percent maximum. Cross slopes that exceed this limit cause wheelchair users to drift toward the low side of the path, requiring constant corrective effort and creating a fatigue and safety concern.
Cross slope deficiencies are common in exterior routes, particularly walkways adjacent to parking lots or along buildings where drainage slopes have been incorporated into the path surface. Measuring cross slope requires orienting the slope gauge perpendicular to the direction of travel, which is a different measurement orientation than running slope.
Surface Conditions
Accessible route surfaces must be firm and stable. Carpeting must be securely attached, have a firm cushion or backing, have a level surface, and have a pile height of 1/2 inch maximum. Gratings, if used, must have openings no larger than 1/2 inch in the direction of travel. Surfaces with holes, loose materials, or significant irregularities fail the stable and firm requirement regardless of their nominal construction.
Changes in Level
Changes in level along an accessible route are strictly regulated. Vertical changes up to 1/4 inch are permitted without treatment. Changes between 1/4 inch and 1/2 inch must be beveled with a slope not steeper than 1:2. Changes in level greater than 1/2 inch require a curb ramp, ramp, elevator, or platform lift to span the change.
Thresholds at doorways are limited to 1/2 inch maximum. Existing or altered thresholds up to 3/4 inch that have beveled edges on both sides with slopes not steeper than 1:2 are permitted as an exception.
Inspectors frequently encounter level change violations at transitions between flooring materials, where tile meets carpet or hardwood, at building entrances where expansion joints create raised edges, and at exterior locations where concrete has settled or heaved. Even a 3/4-inch height change at an interior doorway threshold is a deficiency if it has not been beveled on both sides.
Vertical Clearance
Accessible routes must maintain a minimum vertical clearance of 80 inches throughout their length. This includes corridors, doorways, and exterior pathways. Signs, pipes, ducts, beams, or other overhead elements that reduce vertical clearance below 80 inches along an accessible route are a deficiency.
Where overhead obstructions below 80 inches cannot be avoided, a cane-detectable barrier must be installed at the 27-inch height to warn individuals with visual impairments of the hazard. Inspectors should note any overhead clearance violations and whether appropriate cane-detectable protection has been installed.
Doorways on Accessible Routes
Every door along an accessible route must meet ADA door requirements. This includes a minimum clear opening width of 32 inches when the door is open 90 degrees, hardware that is operable with one hand without tight grasping or pinching, and a maximum opening force of 5 pounds for interior doors. Exterior doors may require more force due to wind and weatherstripping considerations, but the standard should be met wherever possible. For a detailed breakdown of ADA door inspection requirements, see the ADA Door Clearances guide.
Maneuvering clearances at doors are also part of accessible route compliance. Pull-side clearance must be 18 inches minimum alongside the latch edge of the door, and push-side clearance requirements vary based on door approach direction and whether a closer is present.
Curb Ramps on Accessible Routes
Where an accessible route crosses a curb, a curb ramp is required. Curb ramps must have a maximum running slope of 1:12, a minimum width of 36 inches, and a level landing at least 36 inches long at the top. Side flares, where provided, must have a slope not steeper than 1:10. Detectable warning surfaces are required at curb ramps serving transportation facilities and at certain public rights-of-way. For a complete breakdown of ADA ramp standards, see the ADA Ramp Requirements guide.
Inspectors should verify both the slope of the curb ramp itself and the slope of the landing at the top. A landing with a slope greater than 1:48 in any direction fails the level landing requirement and creates a rollback hazard for wheelchair users approaching or departing the ramp.
Protruding Objects
Objects that protrude into the circulation path are a distinct accessible route violation category. A wall-mounted object, such as a drinking fountain, fire extinguisher cabinet, or signage bracket, that protrudes more than 4 inches into the circulation path at heights between 27 and 80 inches reduces the effective clear width of the route and may not be detectable by a person using a cane.
Post-mounted objects must not protrude more than 12 inches when mounted at heights between 27 and 80 inches. Any overhead object with its lowest edge at or below 80 inches must not reduce the vertical clearance below 80 inches.
Common Accessible Route Violations in Real-World Inspections
- Exterior paths exceeding 1:20 running slope: Walkways adjacent to sloped parking areas or building approaches often exceed the maximum running slope without an intervening landing or ramp transition.
- Cross slope exceeding 1:48: Drainage-driven surface slopes that exceed the cross slope limit are extremely common, particularly in older exterior routes.
- Threshold height at entries: Thresholds over 1/2 inch without beveled edges on both sides are a frequent entry-level violation.
- Carpet pile height over 1/2 inch: Thick carpet in lobbies and corridors is a surface compliance issue that is easy to overlook visually.
- Objects protruding below 80 inches: Wall-mounted signage, fire extinguisher cabinets, and drinking fountains are common culprits.
- No passing space in narrow corridors: Service corridors and older building wings often fall below 60 inches without passing spaces at required intervals.
Tools for Accessible Route Inspections
Accurate accessible route documentation requires calibrated measurement tools. A digital slope gauge or analog slope meter verifies running slope and cross slope at precise ratios. A tape measure confirms clear widths and passing space dimensions. A calibrated door pressure gauge verifies opening force compliance at doors along the route. The ADA Inspection Tool Kit is designed for accessibility professionals who need all of these tools in a single portable kit, saving time and ensuring consistent, defensible measurements on every site survey.
Frequently Asked Questions
Does an accessible route need to connect every room in a building?
No. An accessible route must connect accessible spaces and elements. Not every room in a building is required to be accessible. The requirement is that accessible spaces, including required accessible parking, entrances, restrooms, and work areas, are connected by an accessible route.
What is the difference between a running slope and a cross slope?
Running slope is the slope measured in the direction of pedestrian travel. Cross slope is measured perpendicular to travel. Both have separate maximum limits under the ADA. A surface can comply with running slope but fail on cross slope, and vice versa.
Can a route be accessible if one segment fails to meet the slope requirement?
No. An accessible route must comply along its entire length. A single segment with a non-compliant slope breaks the accessibility of the entire route connecting the spaces it serves.
Accurate Accessible Route Inspections Require the Right Approach
Accessible route compliance is not a checklist item. It is a continuous evaluation of every element along every path an individual with a disability might need to travel. Inspectors who approach accessible routes with that mindset, verifying slope, width, surface, clearance, and door compliance at every point, produce reports that protect building owners and contribute meaningfully to accessibility for the people these requirements are designed to serve.
For inspection tools, ADA compliance resources, and ICC exam preparation, visit AllThingsInspector.com. We provide the equipment, knowledge, and expertise that accessibility and building inspection professionals rely on in the field.
