Wheelchair securement standards: WC18, WC19, WC20 and the ADA rules for NEMT

The three standards at a glance

RESNA publishes the US wheelchair transportation standards in one volume, RESNA WC-4, Wheelchairs and Transportation. Sections 18, 19, and 20 are the ones NEMT operators hear about, usually shortened to WC18, WC19, and WC20.

These are voluntary standards. No federal or state law mandates them, and each manufacturer self-certifies that its product meets them. What they give you is a tested combination: a WC19 chair, secured with a WC18 tie-down, carrying a rider restrained with a crash-tested lap and shoulder belt.

All three are crash tested in a frontal sled test at 30 mph. That number is the change in speed during the crash, not the travel speed. University of Michigan researchers explain that it matches the federal crash test for passenger cars and represents about the 95th percentile of real-world frontal crash severity.

WC19: wheelchairs used as seats

WC19 is Section 19 of RESNA WC-4:2017. It sets minimum design and performance rules for wheelchairs that will carry a seated rider in a vehicle. A WC19 chair is also called a wheelchair with the transit option.

The main requirements:

• Four securement points. Easy-to-reach attachment points for a WC18 four-point, strap-type tie-down, with the chair facing forward.
• Crash test. The chair is tested with an appropriately sized crash dummy in a 30 mph frontal sled test.
• Lap belt option. The chair must offer a wheelchair-anchored pelvic belt, crash tested with the chair.
• Belt fit. The chair must rate at least acceptable for how easily a vehicle-mounted belt can be placed correctly on the rider.
• Stability rating. Lateral stability is tested and disclosed as good, acceptable, or poor.
• Labels. The chair and its crash-tested belt carry the WC19 symbol. Postural belts are labeled as not for use as an occupant restraint.
• Instructions. The manufacturer must explain proper securement and restraint.

From the outside, a WC19 chair looks like any other chair apart from the four marked securement points and the labels.

WC18: tie-downs and occupant restraints

WC18 covers the equipment in your van: the tie-down straps or docking device that hold the chair, and the belts that restrain the rider. It applies to products used in public and private vehicles, with forward-facing wheelchairs.

• Dynamic test. The system must pass a 30 mph (48 km/h) frontal impact test with pelvic and shoulder restraints in place.
• Surrogate chair. The test uses a rigid surrogate wheelchair that weighs 187 pounds.
• Wheelchair-anchored lap belt test. Since December 2015, general-use systems must also pass a test with the lap belt anchored to the test wheelchair, which raises the load on the rear straps.
• Standard end fittings. Strap end fittings must latch to the mating points on transport-ready wheelchairs.
• Labels and instructions. Products are permanently labeled with the test they passed, with instructions for installers and users.

Occupant belts come in two setups. An independent restraint anchors both belts to the vehicle. A partially integrated restraint anchors the lap belt to the wheelchair and connects a vehicle-mounted shoulder belt to it, which is the option every WC19 chair must offer.

Heavy power chairs are the weak spot. UMTRI notes that chairs heavier than the 187 pound surrogate put more force on the tie-downs, and that extra straps can be installed for heavier WC19 chairs in vans and minivans. A wheelchair on its own can weigh more than 250 pounds.

WC20: seating systems

WC20 covers aftermarket seating: the seat and back support systems added to a wheelchair frame. The seating system is mounted to a surrogate wheelchair frame and crash tested at 30 mph.

To pass, the seating must keep the dummy seated upright at the end of the test, its main supports must not completely fail, all attachment hardware must stay attached, no part heavier than 150 grams may break loose, and no sharp edges may be left. It is also rated for how well it allows correct placement of vehicle-mounted belts.

What the ADA requires

The voluntary standards describe best equipment. The legal minimum for accessible vehicles comes from 49 CFR 38.23(d) and applies to every chair you carry.

State and broker rules can go further. Virginia requires four fully functional securements per wheelchair station, a working interlock, and a lap and shoulder belt mounted to the vehicle at every station, made specifically for wheelchair riders. Our ADA requirements guide covers the lift, ramp, and service rules around securement.

How to secure a wheelchair, step by step

The University of Michigan program’s Ride Safe brochure sets out the method below. Follow the chair and tie-down manufacturers’ instructions first.

1. Offer a transfer. Best practice is for the rider to move to a vehicle seat when possible. Under the ADA you may suggest it but may not require it.
2. Face forward. Position the chair and rider facing the front of the vehicle.
3. Attach four tie-downs. On a WC19 chair, hook to the four marked securement points. On other chairs, use welded frame junctions or structural points fastened with hardened bolts.
4. Never use moving parts. Do not attach to armrests, footrests, wheels, or anything adjustable or removable.
5. Get the angles right. Rear straps work best at 30 to 45 degrees to the floor, anchored directly behind the chair. Anchor front straps wider than the chair for stability.
6. Remove slack. Tighten every strap until the chair cannot shift.
7. Belt the rider. Place the lap belt low across the pelvis on the upper thighs, not the abdomen, ideally at 45 to 75 degrees from the side view. Route it between the armrest and seat back if needed, so it does not sit on the armrest.
8. Add the shoulder belt. It should cross the middle of the shoulder and the center of the chest and connect to the lap belt near the hip. The upper anchor should sit above and behind the shoulder.
9. Check the recline. Keep the backrest at 30 degrees or less from vertical. If the rider needs more, move the shoulder belt anchor back along the sidewall.
10. Stow loose items. Trays, bags, and equipment not needed during the ride should be removed or secured.

Clamp-type securement devices are not recommended, because they did not hold chairs well in frontal crash testing.

Securing chairs that are not WC19

Most chairs you carry will not be WC19. Many heavy power chairs have plastic shrouds that hide the frame, and some have no good attachment points at all.

UMTRI’s advice for these chairs:

• Look for welded tubular frame junctions, which usually give two front and two rear points.
• Consider permanently attached strap loops on strong structural members, routed through the shrouds so they are easy to reach. Most tie-down manufacturers sell them.
• For a tilt-in-space chair, attach all four straps either to the seat frame or to the base frame, never mixed.
• Work with the rider, family, and the chair supplier when a chair is hard to secure.

You still carry the rider. The ADA bars denying the trip because the chair cannot be secured satisfactorily by your system.

Training and daily checks

Securement is a hands-on skill. CTAA’s Full PASS certification covers lift operating procedures and wheelchair and occupant securement, taught in person on the type of vehicle the driver will use. Our driver training guide covers when to schedule it.

Build securement into the pre-trip inspection too. Count four working straps per station, check belts for fraying, and confirm the floor tracks are clean. The wheelchair securement checklist turns this into a one-page routine.

Where HealthRide helps

HealthRide matches wheelchair riders to vehicles with an open wheelchair space, using the seat and wheelchair capacity you set for each vehicle. Drivers complete a pre-shift vehicle inspection in the driver app, and the results are stored with the shift, ready when a broker asks. See how dispatch handles it on the wheelchair transportation software page.