That depends on 4 factors - size of vehicle you're driving, what you're towing/hauling, the road conditions, and if the vehicle is equipped with ABS or not.
Stopping Distance = about 206.25 feet at 55 mph
135/170
Stopping Distance = about 315 feet at 70 mph
Stopping distance at 30mph = 23m
Stopping Distance = 15 feet
That depends on what vehicle you are stopping from 55 mph. the laws of physics come into play. The heavier the vehicle the longer the stopping distance. So I cannot give an accurate answer except to say that from 60 mph the average for a mid-sized car is around 135 feet.
Stopping distance at 40mph = 36m
Stopping Distance = about 146.25 feet.
When traveling 30-mph, the braking distance is 45-feet, and the total stopping distance is 75-feet. This is the length of a semi-truck and trailer.
The stopping distance at 55 mph varies based on factors like vehicle type, road conditions, and braking efficiency. On average, it takes about stopping distance of stopping distance of 200-250 feet to come to a complete stop, which includes both the reaction distance (the distance traveled while the driver reacts) and the braking distance. If you consider a reaction time of about 1.5 seconds, this adds roughly 120 feet to the total stopping distance.
At 55 mph, the approximate braking distance is around stopping distance of about 200 feet. This includes both the reaction distance (the distance traveled while you react to the need to stop) and the actual braking distance (the distance it takes to stop once the brakes are applied). Factors like road conditions, vehicle type, and driver reaction time can affect this distance.
Any regular passenger vehicle traveling at a speed of 20 mph should stop within a distance of 25 feet, once the brake is applied. At 35 mph, the distance will be approximately 106 feet. At 55 mph, it will be approximately 228 feet. An increase speed will always result in longer stopping distances. In addition, factors such as road and weather conditions and traffic density also affect the vehicle's stopping distance. -Mary Mimms