100 ft
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100
Depends on the type of vehicle you are driving, road conditions, driver reaction time, etc. The average car will take 121 feet to stop after the brakes are applied. Factor in reaction time and the car will travel 265 feet before it stops.
I'm quite sure there is no emergency vehicle anywhere within which you can travel 300 feet.
You should be 2-3 seconds behind a given point that the vehicle in front just passed. At 65 mph, that is 95 feet per second, so multiply by 2 or 3 and you should be 190-280 feet behind
some kind of square tube or tunnel with a total volume of only 0.07 cubic mile