Test Track has an alternate boarding area for guests using wheelchairs. Rather than go down to ground level to get into the car, you can board at the seat belt check area where the ride car if above ground. It is a bit like transferring over the side of a bathtub.
The guest with a wheelchair uses the small elevator (and I do mean small, barely large enough to fit the wheelchair). The rest of the party uses the stair to get up to the boarding area. At the end of the ride, the process is reversed.
