The stopping distance at 30 miles per hour is 23 meters Speed = 30 miles per hour = 13.41 meters per second Substitute the values in the formula and solve to get the car stopping distance.Ģ. Get the perception-reaction time, grade, and speed details. The stopping distance of a car can be calculated using the AASHTO formula. Therefore, the car stopping distance is 149.93 m.Īvail the handy calculators for any kind of physics concepts all under one roof Physicscalc.Com and clear all your concerns during your homework or assignments.ġ. If the perception-reaction time is 10 seconds, grade is 0.2% and find the stopping distance. Question: A car is moving with a velocity of 50 m/s on a dry road and suddenly applies brakes. It is positive for an uphill grade and negative for a road-going downhill.

It is equal to 0.7 for a dry road and ranges from 0.3 to 0.4 on a wet road. S = (0.278 x t x v) + v┬▓/(254 x (f + G))į is the coefficient of friction between the tires and the road. The stopping distance depends on the road conditions such as dry or wet, speed of the car, perception-reaction time and others. This AASHTO formula is used in road design for establishing the minimum stopping sight distance.

Calculate stopping distance of car travels using the AASHTO (the American Association of State Highway and Transportation Officials).

Stopping distance g force calculator