Speed Laws are of no use. Buses continue to jump redlight at speed of 80.
Innocent motorists are challaned for no rhyme or reason. It's a previlage.
Speed of 50 Km is recommended by IIT. Probably the law-geek says since it gives response time to brake if any foreign body comes ahead.
Probably they must be expecting bulls and cows on the road and numerous cyclists. So you see it is a social mingling area. Every entity has a right to be social. That's what a road(& even a highway)is for-Diplomatic.