BTW i don't know k ab agar yeh masla hai, but i remember that when my chachu traveled from Karachi to Peshawar, the police waalas used to put the check posts in RANDOM places, forcing drivers to make some high speed maneuvers... My chachu actually encountered a police waala setting the post out, and since he did it really quickly, my chachu had to swerve out of the path.
Again, drive safe and enjoy your trip (Y)