Parking stops and wheel stops: what they protect and the trip hazards they can create
How to place and maintain wheel stops so they guide cars without tripping people
Safety Behind the Wheel Foundation built this guide from Occupational Safety and Health Administration (OSHA) rules, U.S. Access Board accessibility guidelines, Federal Highway Administration (FHWA) guidance and published research on parking lot injuries, falls and child supervision. Every source is listed at the end.
What a wheel stop is and who decides where it goes
A wheel stop is a short, fixed block at the head of a parking space. You may also hear it called a parking stop, car stop or parking block. Most are made of concrete, rubber or plastic, and they are anchored to the pavement.
The idea is simple. When a front tire reaches the block, the driver sees or feels that the space has ended. That limits parking overrun, which means a car moving past the front of its space into whatever lies beyond. Common examples are a planter bed, a fence, a sidewalk, a utility cabinet or a walking path.
Property owners, businesses, homeowners associations (HOAs), warehouses and campuses buy most wheel stops. They come from industrial safety suppliers, traffic suppliers and qualified property contractors, such as paving and striping firms. The owner of the lot makes the choice. On public land, that owner is a city, school district or transit agency. Residents should ask that owner for a review and should never install devices on their own.
Think of a wheel stop as a trade. It buys a gentle cue for drivers. It costs a raised object where people walk.
Why parking areas deserve a closer look
Parking areas are easy to overlook. The National Highway Traffic Safety Administration (NHTSA) tracks harmful events that happen off the trafficway in a separate system called Non Traffic Surveillance [1].
Work related deaths show part of the picture. A Bureau of Labor Statistics researcher studied on the job parking lot deaths in the United States from 1993 to 2002 and counted about 206 per year [2]. Contact with objects made up 15% of the events, and pedestrian deaths made up 13% [2]. Violence made up a larger share, so not every death involved a moving vehicle [2]. The author also noted that parking lot design may influence injuries, although that is hard to measure [2].
Children add another layer. In one study, observers watched 124 children aged 2 to 10 cross a lot with an adult. More than two thirds of the children were unsupervised at some point, and about 90% were beyond arm’s reach of the adult at some point [3]. People on foot often pass between stalls.
What wheel stops do well
A wheel stop works best as a cue. It tells a driver where to stop, and it does so for every car, every day, without a sign. In lots with many drivers, that steady cue helps keep cars off landscaping, fences and equipment.
It can also protect a walking route. The federal accessibility guidelines say parked cars and vans must not block the required clear width of an adjacent accessible route [5]. An accessible route is a continuous, unobstructed path that people using wheelchairs, walkers or canes can follow. A car’s front end reaches past its front tires. A stop set far enough back keeps that overhang off the walkway.
Wheel stops may also add a layer where a car could roll. A forensic study in one apartment lot tested a car rolling down a slope that looked almost flat. Even slow rolling could seriously injure the chest of a person who could not step away [4]. A wheel stop is one low cost backstop for that risk. It does not replace level stalls, a set parking brake or a car left in park.
The other side: a trip hazard on the ground
A wheel stop is a raised object near ankle height. People do not expect it, and they often do not look down in a lot. They watch traffic, carts, phones and children.
Falls are a large public health problem. A study of U.S. survey narratives from 1997 to 2010 found that falls were the leading cause of injury in almost every age group. Injuries linked to tripping rose with age [6]. The three hazards named most often were large objects (15% of fall related injuries), stairs and steps (14%) and slick or dirty surfaces (13%) [6]. That study did not look at wheel stops, but a fixed block on a walking surface fits the pattern.
Risk rises when the stop is hard to see. Gray concrete on gray asphalt blends in, and shadows, rain, snow, leaves and dusk make it worse. People with low vision, older adults, children and anyone pushing a stroller or cart are most exposed.
Workplace rules treat this kind of hazard as the owner’s job. The federal workplace safety agency, OSHA, defines a walking working surface as any surface an employee walks on or uses to reach a work area [7]. Its general rule says those surfaces must be kept free of hazards such as sharp or protruding objects [8]. In places that use mechanical handling equipment, such as forklifts, aisles and passageways must be kept clear and in good repair. No obstruction may cross them that could create a hazard [9]. Whether a given lot falls under these rules is a question for the employer’s safety professional or OSHA.
Accessibility guidelines are more specific. A change in level of up to 1/4 inch may be vertical. A change between 1/4 and 1/2 inch must be beveled. Anything higher than 1/2 inch must be ramped [5]. A wheel stop is far taller than that, so it should never sit on an accessible route. Access aisles beside accessible parking spaces must also stay at the same level as the spaces they serve [5].
Where wheel stops belong, and where they do not
Placement decides whether a wheel stop helps or hurts. A site review walks each stall and asks two things. What lies beyond the front of it, and who walks there? The table sums up common cases.
Comparison compiled by Safety Behind the Wheel Foundation
Where wheel stops work and what to watch for
| Where | What usually works | Watch for |
|---|---|---|
| Stall faces landscaping, fence or equipment | A stop that halts the tire well short of the target | Overhang: cars reach past their tires |
| Stall faces a sidewalk or path | A stop set back so the route keeps its full clear width, generally at least 36 inches [5] | A stop at the curb edge lets car noses block the path |
| Accessible space and access aisle | Keep the aisle level and free of blocks [5] | A shifted block can close the route |
| Foot path between rows | A clear, marked gap with no blocks across it | People step over blocks when in a hurry |
| Loading dock or truck yard | Set brakes and wheel chocks under trucks being loaded [10] | A pavement block is not the rule’s answer |
| Charging bays | A position that keeps cords off the walking route | Cords add a second trip point |
| Sloped stall | Level the stall where possible | A block is a backstop, not the fix [4] |
The best first move is often to keep people and vehicles apart. OSHA’s guidance on forklift traffic suggests walkways and protective barriers to separate pedestrians from vehicles, with floor striping when barriers cannot be used [11]. Safety Behind the Wheel Foundation gives site owners the same advice. OSHA’s backover guidance suggests internal traffic control plans that tell drivers where to go and separate workers on foot from moving equipment [12]. A wheel stop fits into that plan as one small part.
Why a wheel stop is not a barrier
Cars do not only roll into stops. Drivers sometimes press the accelerator when they mean to brake. A human factors study notes that this kind of pedal mistake can cause severe collisions, especially for older drivers [13]. A car pushed forward by a pedal mistake should not be expected to stop at a low block.
A crash barrier is built to stop or redirect a moving vehicle, and it is tested for that job. For roads, the crash test standards are known as MASH [14]. Even then, the Federal Highway Administration (FHWA) notes that laboratory tests cannot cover every situation a driver may face [14]. A plain wheel stop is made to cue a tire, not to take a hit. Treat it that way.
Never use wheel stops to protect people or buildings. That includes sidewalks, outdoor seating, bus stops, bike racks, storefronts, building entrances, utility equipment and playground edges. Those places need engineered protection chosen by a qualified designer. Bollards and walkway barriers are separate topics, and a design professional should size them for the site.
Common mistakes include:
- Stacking two stops, or using extra long blocks, to act as a barrier.
- Placing stops at a building front or where people wait.
- Skipping anchors, so blocks slide, tilt or kick loose.
- Leaving broken or shifted stops in place for months.
- Choosing a color that matches the pavement.
Choosing a wheel stop
Start with the purpose, then the site. A designer or contractor should match the product to the vehicles that use the lot, the pavement type, the climate and the snow plan.
These points deserve a close look:
- Material. Concrete is heavy and rigid. Rubber and plastic are lighter. Each wears differently, so ask how long each lasts in your climate.
- Size and length. The block should suit the stall. Ask whether low front vehicles that use the lot will clear it.
- Color and contrast. A bright color or reflective strip helps people see the block at dusk and in bad weather.
- Anchoring. Ask what anchors the maker requires for your pavement. Check for exposed hardware, sharp corners and chips.
- Drainage and snow. Leave room for water to flow. Plan for plows and mowers, and mark the blocks so crews can see them.
Local rules may set details. A city or county planning or building office can say whether site plan, zoning or accessibility review applies to your lot. On public property, installation goes through the agency that owns the lot.
Installing and keeping them in good shape
Even a good wheel stop turns into a hazard when it breaks or shifts. A short, regular walk through catches most problems.
- Walk the lot in daylight, then again at dusk or after dark. Contrast and shadows change.
- Check each stop for cracks, chips, tilt, sliding, loose anchors and exposed hardware.
- Check position. Does any stop, or any parked car’s nose, narrow a walkway or ramp?
- Check visibility. Look for faded paint, dirt and worn reflective strips.
- Look for seasonal problems, such as snow piles that hide stops, leaves, overgrown plants and plow damage.
- Repair or replace damaged stops quickly. Until then, cone off the stall or remove the broken block.
- Keep a dated log with photos, and review any reports of trips or bumper strikes.
For businesses open to the public, the federal Americans with Disabilities Act (ADA) rule says features that must be accessible have to be kept in working condition. Short interruptions for maintenance or repairs are allowed [15]. A shifted block that narrows an accessible route is a maintenance issue that should be fixed promptly.
Weighing the trade: a short decision routine
Before you add a wheel stop, or decide to keep one, run this check.
- Name what the stop protects. If the answer is a person, a building or costly equipment, choose engineered protection instead.
- Map where people walk, including shortcuts. Include how children, older adults and wheelchair users move through the lot.
- Test the geometry. Is there room for the car, its overhang and the full walking width?
- Compare alternatives. Options include a continuous curb, a planter edge set back from the sidewalk, a wider walkway, a marked gap in the row or a different stall layout.
- If a stop stays, make it visible, anchor it well and add it to the inspection list.
What drivers, residents and employees can do
Drivers can treat a wheel stop as a warning, not a brake. Pull in slowly. Stop before the tire touches the block. Shift to park and set the parking brake, especially on a slope.
When you walk, use marked walkways and crossings rather than the gaps between cars. Hold a child’s hand from the car door to the entrance, since many children stray beyond arm’s reach in lots [3].
If you see a cracked, tilted or missing stop, or a stop across a walking route, report it. Tell the property manager, HOA board, campus facilities office or employer. Give the exact location, a photo and the date. For a public lot, contact the agency that runs it, such as public works, the school district or the transit agency. If a block narrows an accessible route, say so in your report.
Employees can also raise the issue through a safety committee or supervisor.
Frequently asked questions
Are wheel stops required in parking lots?
This review did not find a federal rule that requires them in ordinary parking spaces. OSHA’s powered industrial truck rule does call for wheel stops or similar protection to keep railroad cars from moving during loading, but that is a different setting [10]. Local zoning, site plan or building rules may set requirements. Ask your city or county planning or building office.
How tall should a wheel stop be?
Heights vary by product, and no single height fits every mix of vehicles. Ask the designer to match the stop to the vehicles that use the lot and to local rules. The key checks are position, contrast and secure anchoring.
Can a wheel stop protect a storefront or a sidewalk?
No. A wheel stop is a cue for a parked tire, not a barrier. A car under power can pass over it, and lab tested roadside hardware has limits of its own [14]. Places where people walk, wait or sit need engineered protection chosen by a qualified designer.
Do wheel stops belong in accessible parking spaces?
Federal guidelines require that parked cars not block the clear width of an accessible route. They also require access aisles to be level with the spaces they serve [5]. A stop that closes the route or sits in the aisle causes problems. Ask an accessibility specialist to review the layout.
Who is responsible if someone trips on one?
That depends on the facts and on state law, and this article cannot answer it. Owners can lower risk by inspecting often, fixing damage fast and keeping stops visible and out of walking routes. For a specific event, talk with your own insurer or an attorney.
The bottom line
Recommendation from Safety Behind the Wheel Foundation
Safety Behind the Wheel Foundation recommends keeping wheel stops out of walking routes and choosing engineered protection wherever people or buildings need it. A wheel stop is a small tool with a narrow job. It cues a driver to stop and keeps a car’s nose out of planters, fences and walkways. It also puts a raised object on ground where people walk, and it cannot stop a car that is under power.
Good results start with four questions. What is the stop protecting? Where do people walk? Can they see it? Who checks it? Use wheel stops where they fit, keep them out of walking routes, inspect them often and choose real barriers where people and buildings need protection.
Related articles
Sources and further reading
- 1National Highway Traffic Safety Administration. Non-Traffic Surveillance. Updated: date not shown on page. nhtsa.gov/node/99391
- 2Fayard GM, Bureau of Labor Statistics. Work-related fatal injuries in parking lots, 1993-2002. Journal of Safety Research, published 2008. Data year: 1993 to 2002. pubmed.ncbi.nlm.nih.gov/18325411
- 3Rouse JB, Schwebel DC. Supervision of young children in parking lots: Impact on child pedestrian safety. Journal of Safety Research, published 2019. pubmed.ncbi.nlm.nih.gov/31847996
- 4Lee Y, Park S, Yoon S, Kong Y, Goh JM. Pedestrian accident analysis with a silicone dummy block. Forensic Science International, published 2012. pubmed.ncbi.nlm.nih.gov/22455985
- 5U.S. Access Board, 36 CFR Part 1191, Appendix D. Technical provisions of the ADA Accessibility Guidelines (sections 302, 303, 403, 502). Current through October 1, 2026. ecfr.gov/…/appendix-Appendix%20D%20to%20Part%201191
- 6Timsina LR, Willetts JL, Brennan MJ, et al. Circumstances of fall-related injuries by age and gender among community-dwelling adults in the United States. PLoS ONE, published 2017. Data year: 1997 to 2010. pubmed.ncbi.nlm.nih.gov/28472065
- 7Occupational Safety and Health Administration. 29 CFR 1910.21 – Scope and definitions. Current through October 1, 2026. ecfr.gov/…/section-1910.21
- 8Occupational Safety and Health Administration. 29 CFR 1910.22 – General requirements. Current through October 1, 2026. ecfr.gov/…/section-1910.22
- 9Occupational Safety and Health Administration. 29 CFR 1910.176 – Handling materials, general. Current through October 1, 2026. ecfr.gov/…/section-1910.176
- 10Occupational Safety and Health Administration. 29 CFR 1910.178 – Powered industrial trucks, paragraph (k). Current through October 1, 2026. ecfr.gov/…/section-1910.178
- 11Occupational Safety and Health Administration. Powered Industrial Trucks (Forklift) eTool: Understanding the Workplace, Pedestrian Traffic. Updated: date not shown on page. osha.gov/…/pedestrian-traffic
- 12Occupational Safety and Health Administration. Preventing Backovers. Updated: date not shown on page. osha.gov/preventing-backovers
- 13Hasegawa K, Kimura M, Takeda Y. Pedal Misapplication: Interruption Effects and Age-Related Differences. Human Factors, published 2020. pubmed.ncbi.nlm.nih.gov/32613865
- 14Federal Highway Administration. Reduce Crash Severity. Updated March 12, 2025. highways.dot.gov/…/reduce-crash-severity
- 15U.S. Department of Justice. 28 CFR 36.211 – Maintenance of accessible features. Current through October 2, 2026. ecfr.gov/…/section-36.211
This article reflects the safety priorities of parking lot design, pedestrian access and fall prevention. It is general education, not legal, insurance or professional design advice, and it does not replace a site review by a qualified designer. Rules change, so verify details with official sources. For your own lot, contact the property owner or manager, your city or county planning or building office, an accessibility consultant, your workplace safety professional or OSHA, and your insurer. Reviewed October 2026.
Cite this article: Safety Behind the Wheel Foundation. “Parking stops and wheel stops: what they protect and the trip hazards they can create.” drivewithcare.org, https://drivewithcare.org/parking-stops-wheel-stops-trip-hazards/. Reviewed October 2026.
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