In most areas it is 150 feet behind. I have been places where it is 300 feet behind.
10 feet
2
25 feet
200 feet
100 feet
100 feet
500 feet
You should stop 50 feet behind a school bus.
The two men following Bella in 'Twilight' were originally 9 feet behind her.
1,000 feet
at a set of red lights. how many feet should you be behind the vehicle in front of you?
100 ft4 seconds