I tried doing a google search and came up empty. What is the distance of "a car length"? 15 feet? 20 feet? 25 feet? 30 feet? When driving behind someone (say on the freeway), I tend to stay 2 seconds (or more) behind them. Say at 60 mph (88 feet/second) this is 176 feet. Some would say keep 6 car lengths behind someone when driving 60 mph. But how long is that? Weigh in!