Depends entirely on the size of the vehicle. The average stopping distance for a vehicle is around 160 feet. That includes 51 feet you will travel during your reaction time. And 109 feet braking distance.
Stopping Distance = about 315 feet at 70 mph
Stopping Distance = 15 feet
Stopping Distance = about 146.25 feet.
Stopping Distance = about 75 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.
It depends on the car's stopping power. An average distance for 40 mph would be around 85 feet
Stopping Distance = about 206.25 feet at 55 mph
200 feet
85 feet
53 metres/ 175 feet
243 feet
Stopping distance at 30mph = 23m