**1.**The safe stopping sight distance for design speed of 50 kmph two way traffic on a two lane road assuming co-efficient of friction as 0.37 and reaction time as 2.5 seconds is

**61.4 m.**

**2. T**he stopping sight distance for design speed of 80 kmph for two way traffic on a single lane road. Assume co-efficient of friction as 0.35 and reaction time as 2 seconds, is

**232.94 m.**

**3.**What is the minimum sight distance required to avoid head on collision of two cars approaching from the opposite directions at 90 and 60 kmph? It is given that the reaction time is 2.5 seconds, co-efficient of friction is 0.7 and a break efficiency is 50 percent in either case.

**Sol: 235.8 m.**

**4.**What is the stopping sight distance on a highway at a ascending gradient of 5% for a design speed of 70 kmph assuming co-efficient of friction as 0.35 and reaction time as 2 seconds?

**Sol: 87.14 m.**

*Reference: GATE 2013 by GK publishers (refer for elaborate answers)*