When M2 was officially opened.. it had the highest speed limit in the world @140kmph. Unfortunately people don't respect that had didn't change their reckless attitude of driving. as a result of many fatalities the speed limit was reduced to 120.
If u have ever gone to karachi and visited sea-view area... the road was damn cool... however all wannabes hit the gas like anything... and now the road is full of speed breakers.