85 feet
You should not be travelling on a pavement at 70 mph!
Dry pavement of course.
The total stopping distance for a car travelling at 30 mph on a dry surface is about 75 feet. However, you may wish to note that in most countries, driving a car on the pavement is illegal.
23 meters on a dry pavement.
That depends on type of vehicle, vehicle condition, weight in or being towed by vehicle, tire condition and model, ABS equipped? all sorts of things.
Coefficient of friction on dry pavement is around .7 to .75 On snow or ice, it would be around .25 to .3 So, for example at 30 mph, stopping distance on dry pavement would be 40-42 feet. On snow or ice, it would be 100-120 feet. As you can see, it increases quite a bit.
To check stopping distance on dry pavement at night, conduct a controlled test in a safe, open area away from traffic. Use a vehicle with working headlights and ensure visibility is adequate. Accelerate to a specific speed and apply the brakes firmly while measuring the distance it takes to come to a complete stop, using markers or a measuring tape. Repeat the test multiple times for accuracy and consistency.
Total stopping distance and 55 mph including reaction time is approximately 216 feet on dry pavement. On wet pavement it will be about 270 feet. This is assuming you have good tires and average reaction time.
3 seconds behind him, no matter the speed on dry pavement. More on wet pavement.
Stopping distances while driving on ice or snow can be up to 10 times longer than on dry pavement. It is important to increase following distance and reduce speed to allow for the longer stopping distance when temperatures drop below freezing. Additionally, using winter tires can help improve traction and decrease stopping distances.
Your stopping distance on a snow covered road it 10 times great than on dry pavement. So, the answer to your question is to increase your space cushion by 10 times.
frition force act on it