There seems to be no formal parking regulations in Egypt. Commonly, people leave the handbrakes off their cars on flat ground to allow others to push their cars to and fro to be able to park.
Paid parking consists of paying a local to find you a parking spot, some will even park the car for you before handing over the key – anything to earn a tip!
Rarely will a car get towed and even then it has to be seriously obstructing a road or entrance.
Disabled parking is non-existent in Egypt and the best you'll manage is to rely on a kindly local to assist in return for a few coins. Most parking is ad hoc and if you find a space that is convenient and close to where you want to go, most would just park there.