It depends upon the weight of the car, the coefficient of friction for the brake linings, and the type of tire and contact with the road surface. A Formula One car can stop in these conditions very quickly. See this link for further explanation: http://www.csgnetwork.com/stopdistinfo.html A calculator can be found here: http://www.Oregon.gov/OSP/PATROL/stop_brake_distance_chart.shtml
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.
4.6 meters or 15ft. is the estimated stoping distance of a vehicle travelling at 25 MPH. Thinking time and weather or not you are sober have not been taken into account.
44feet
3 meaters
1/2
Yes it will need the stopping distance of a automobile traveling at the same speed and then it will need a few hundred more feet as well.
Stopping Distance = about 315 feet at 70 mph
53 metres/ 175 feet
23 meters in normal conditions
Stopping distance at 30mph = 23m
Stopping Distance = 15 feet
Stopping Distance = about 206.25 feet at 55 mph