Dear brother,
Assalam Alaikum.
The speed breakers constructed by the authority, using standard dimensions, with proper signboards are acceptable.
However, the illegally constructed speed breakers without proper standards destroy roads and damage our vehicles. Especially in Karachi the criminal elements use these for their evil purposes.
On the other hand-- while walking it is my responsibility to look both sides for incoming traffic before crossing the road. Every person whether walking or driving, is equally responsible for safety. He (or she) is supposed to enter road with full attention and not with the household issues overruling the thought process. May Allah keep everyone safe.
Best wishes!
RZ