If I use a very heavy wheelchair that may exceed the capacity of existing tiedown devices, when should I use additional tiedown straps?
The question of when and whether to use additional tiedown straps is up to the wheelchair user, the transit provider, etc. and depends on a number of factors. The answer probably also depends on whether the wheelchair complies with a transport standard (WC19), as will be explained shortly. For heavy wheelchairs that do NOT comply with the transport standard, the more straps the better. However, finding four suitable securement points (much less, more than 4!) is problematic on many wheelchairs, and of course none of these additional securement points have been dynamically tested. The need for additional straps also depends on the type of vehicle and transit mode. For large city buses and large school buses, more than four straps is probably not warranted, especially for transport-tested wheelchairs, since this type of vehicle is very unlikely to ever experience a 30-mph crash to which tiedown straps that comply with tiedown standards have been tested. Another factor that could influenc
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