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.
You should use a wheelchair on rocky terrain.
A paved even road is a bad place to use a wheelchair 
( z1 recommend :ARG1 ( z2 use :ARG0 ( z3 you ) :ARG1 ( z4 wheelchair ) :location ( z5 terrain :mod ( z6 rocky ) ) ) )