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This depends on your speed and may depend on what country you live in. Where I live you should travel at a distance suitable for the speed you are traveling.
Behind you
20 feet
20 feet
20 feet
You should always stay a safe distance behind large trucks. They have a lot of blind spots and are unable to see smaller cars and trucks. You should also stay back because you never know what is going to fall out of the back or if the truck is going to kick up a rock and hit your car or windshield.
The distance between you and the vehicle in front of you.
three car spaces
Allow a minimum of 3 seconds of braking distance at 55 MPH, add an extra second for each 5 MPH increase in speed.
To increase your stamina you run/jog certain distance everyday. As the days go on you should increase the distance you run. You will start seeing results in 2-3 weeks time.
The rule of thumb is one car length for every 10 miles per an hour that the car you are driving is traveling. For example: You are traveling 70 miles an hour on the interstate, the car you are following should be seven car lengths ahead of you.
That is a 282 mile trip. It should take just under 5 hours.