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A 4-point wheelchair tie-down system — also called a wheelchair tie-down and occupant restraint system (WTORS) — uses four separate attachment points to secure a wheelchair to the floor of a transport vehicle. Two straps or retractors attach to the front of the wheelchair frame, and two attach to the rear, creating a stable 4-point anchor that prevents the chair from moving during transport.

Here are reliable video tutorials demonstrating 4-point tie-down securement for wheelchairs in vehicles. These match the angles and points from prior posted diagrams, like 30°-45° rear and 40°-60° front straps.[youtube][wc-transportation-safety.umtri.umich]

 Wheelchair securement systems typically consist of three parts, the occupant securements, the wheelchair securements, and floor anchors to assist in securing the wheelchair and rider in place.