Punitive damages are only awarded to an injured plaintiff when the wrongful behavior of the defendant was despicable or reprehensible. A common scenario where punitive damages are awarded arises when a defendant is found guilty of wanton or malicious acts or of fraud.
Wikipedia has an article on: speed cushion. Wikipedia. speed cushion (plural speed cushions) A form of speed bump, often one of a series, that allows larger (especially emergency) vehicles to straddle them without slowing down.
Some people have been able to benchmark the speed of a power wheelchair at speeds of up to 11+mph. However, the stability and maneuverability for a power chair at those speeds is seriously questionable, as you are not able to control the wheelchair as well when reaching those speeds.