Quote:
Originally Posted by actwithclarity
It would take 0.123 seconds to travel 10ft at 55mph. However since a truck cannot stop instantly (lol), saying you only have that long to react is kind of dumb. The main concern is you have to be able to decelerate faster than the truck.
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10' back, you'd cover the gap in about 1.3 second if the driver decelerates only 5mph.
50 feet back, though still too close, you still get half the max. benefit.