The Following information on stopping distances comes from the
California Department of Transportation.
(This information is based upon a car or small truck. Remember that vehicle weights can effect stopping distances as well)
Stopping distances vary according to road and weather conditions. on
any icy road, for example, a vehicle may travel four times the distance
it would require to stop on dry pavement. The following information is
provided for a driver traveling at 70 miles per hour and then applying
On dry pavement a vehicle traveling at 70 mph would require about 600
feet of stopping distance.
The same vehicle traveling at 70 mph on wet pavement will require close
to 800 feet stopping distance.
If the vehicle was traveling on a snow packed surface the distance
increases to close to 1300 feet for stopping at 70 mph.
Finally, a vehicle traveling 70 mph on a surface with ice will require
as much as 2500 feet of distance to come to a full stop.