It is not seconds, but car length. If you are seconds behind someone and they stop fast you will hit them.
Drivers should look 12 to 15 seconds ahead of their vehicle on city streets and ______ seconds ahead on freeways
One should look 10 to 12 seconds ahead to avoid collisions.
10/15
I was taught that you should look ahead a minimum of 15 seconds ahead. That equates to about a block to a block and a half ahead of you.
10 seconds (1/4 mile ahead)
12-15 seconds
12-15 seconds.
4
20
30 seconds
2 seconds is the safe distance.
You would need to position yourself 30 seconds ahead.