Final answer:
The speed that permits stopping at half the range of vision is known as the stopping distance. It is determined by the driver's reaction time, braking time, and the initial speed of the vehicle.
Step-by-step explanation:
The speed that permits stopping at half the range of vision is known as the stopping distance.
The stopping distance is the total distance a vehicle travels during the driver's reaction time (the time it takes to perceive a need to stop) and the time it takes for the vehicle to come to a complete stop after the brakes are applied.
To calculate the stopping distance, you need to take into account the driver's reaction time, the braking time, and the initial speed of the vehicle.
The formula to calculate the stopping distance is:
Stopping distance = (reaction time x initial speed) + (initial speed^2 / (2 x braking deceleration))