there are no documented speed bumps anywhere in Karachi, all the speed bumps are made by "gandasaa raaj" and thug power be it Navy, Army, street goon etc. In North Nazimabad Karachi, the residential areas had sidewalks for pedestrians, vents for sewer lines rising up as poles, flood drainage on the sides of roads, placements of hydrants for firefighting, high rise water tanks so houses could do without underground and overhead tanks. BUT ALL one by one got lost, the sidewalks have been illegally occupied by people extending their houses, the sewer line breathers have been cut and sold off for money, flood drains have been choked and subsequently their grates have been stolen and sold, the high rise water tanks on the single mountain of North Naz have been demolished as its water leaks could never be rectified. The main road splitting north Nazimabad in two is as wide as a grand highway in Pakistan, and because of the monsoon flooding it becomes a lake because we lost the flood grates and our municipal authorities shoved all dirt, leaves, debris into them, their tops have been cemented on unlike the original removable slabs
So - in a nutshell, its the same situation as we maintain our cars, we try to find overrides and shortcuts to get over whatever can get the thing going NOW - who cares about later and its consequences - same with speedbreakers - if someone's chacha, phoopa, mamoo, cousin etc is some big wig or decorated brass or even some sort of authoritative cop - they will force a speed breaker infront of their house and if you complain they will threaten you. Reminds you that you are living in a Brigand society.