Minimum Stopping Sight Distance for Lane, Two-Way Traffic

The minimum stopping sight distance is the minimum distance required for a driver to stop a vehicle in case of any obstruction on the road. It is calculated by adding the perception distance, reaction distance, and braking distance.

Given that the stopping distance is 60 meters, we can calculate the minimum stopping sight distance for lane, two-way traffic as follows:

Perception Distance
The perception distance is the distance traveled by the vehicle from the time the driver sees an obstruction to the time the driver decides to apply the brakes. It is calculated as:

Perception Distance = Speed x Perception Time

Assuming a perception time of 1.5 seconds and a speed limit of 50 km/h (or 13.89 m/s), we get:

Perception Distance = 13.89 m/s x 1.5 s
Perception Distance = 20.83 meters

Reaction Distance
The reaction distance is the distance traveled by the vehicle from the time the driver applies the brakes to the time the vehicle comes to a complete stop. It is calculated as:

Reaction Distance = Speed x Reaction Time

Assuming a reaction time of 1 second, we get:

Reaction Distance = 13.89 m/s x 1 s
Reaction Distance = 13.89 meters

Braking Distance
The braking distance is the distance traveled by the vehicle while coming to a complete stop. It is calculated as:

Braking Distance = (Speed/2)^2 / (Braking Deceleration)

Assuming a braking deceleration of 4.5 m/s^2 (as per Indian road conditions), we get:

Braking Distance = (13.89/2)^2 / 4.5
Braking Distance = 21.65 meters

Minimum Stopping Sight Distance
The minimum stopping sight distance is the sum of the perception distance, reaction distance, and braking distance. Therefore, we get:

Minimum Stopping Sight Distance = Perception Distance + Reaction Distance + Braking Distance
Minimum Stopping Sight Distance = 20.83 + 13.89 + 21.65
Minimum Stopping Sight Distance = 56.37 meters

Since the given stopping distance is 60 meters, the minimum stopping sight distance for lane, two-way traffic is 60 meters. Therefore, the correct answer is option B (60 m).