You must not park other than in authorised parking spaces in the central districts of the large towns and cities. Elsewhere you can park wherever you find a space. Wherever you park it must not cause obstruction.
Many authorised parking spaces in the big cities are covered by ticket machines. Parking charges are low, the equivalent of 10p for an hour and you’ll know your car is safe. There are garages and parking areas which are also controlled by charges and these often give more security as they are attended.
Enforcement of parking is done by the police but generally only when an obstruction is caused. Overstaying your parking time on authorised spaces can earn a ticket but this is rarely enforced.
There are no concessions for disabled drivers in Pakistan but if you used parking garages or lots that are attended you’ll usually find someone who is prepared to assist.