Exactly how are PMDs being "abused". Based upon what I see on youtube and from what I gather from the stats the most abused form of transport is the car. They are allowed to be driven by the blind, used for racing on the road and are invariably driven in a manner which causes massive death and destruction every single year.
Cars the primary cause of traffic deaths. No other mode of transport comes close.
Pmd create problems for street walkers. When they come fast towards the same direction of the walker, and the walker were to switch walking lane without knowing the back oncoming pmd, the injury can be fatal. Walker doesn't have rear mirror with them.
Besides that they hog the lift and mrt space. And also cause fire.
Cars create problems on the road.
Each has their own problems and resolutions as below.
For pmd, restrict it to the said wheelchair kind to serve the required needs of a disabled person.
For cars, issue license only to valid responsible drivers like myself. Then you will get near 0 accident statistics.