Did you see the Part I of this lecture?

Wheelchairs are designed to provide mobility to individuals and not designed as automobile seats, so, in many cases, the level of protection that wheelchair and its seating systems can provide under impact is unknown.

WCSSs are often provided as add on or replacement products after the wheelchair has been in the field, so they will not be sled tested by the ANSI/RESNA WC/19 standard.

Therefore, as part of wheelchair transportation safety researches, crashworthiness of wheelchair seating systems have been also evaluated.