How to operate a wheelchair safely outdoors<br>Stay on even surfaces. Uneven surfaces can make any wheelchair get off balance. Even when someone is pushing a wheelchair, an uneven surface can cause harm.
Wheelchairs are safe no matter what surface its on
( z1 safe :ARG0 ( z2 wheelchair ) :ARG1-of ( z3 regardless :ARG2 ( z4 surface :location-of z2 ) ) )