WC20 and Secondary Postural Supports When Traveling in Motor Vehicles Last month, we looked at Wheelchair Tie downs and Occupant Restraint Systems (WTORS) and the previous month, we looked at WC19 - the voluntary standard for wheelchairs used as seats in motor vehicles. Let's continue our look at the factors that enhance safety for individuals who remain seated in their wheelchairs while travelling in motor vehicles. Specifically, we will look at WC20, which is the voluntary standard related to seating devices for use in motor vehicles, and we will look at some of the recommendations from the Guidelines for Use of Secondary Postural Support Devices by Wheelchair Users During Travel in Motor Vehicles. 2015-01-21 Keep Reading