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 safer on water than on land
Wheelchairs are safer on even surfaces
( z1 safe :ARG0 ( z2 wheelchair ) :location ( z3 water ) :ARG2-of ( z4 have-degree :ARG1 z2 :ARG3 ( z5 more ) :ARG4 ( z6 safe :ARG0 z2 :location ( z7 land ) ) ) )