You maybe ahead of 12 cars on your offramp, but you've also caught up to 12 cars that haven't had a chance to get off the offramp, yet. The amount of traffic on

You maybe ahead of 12 cars on your offramp, but you've also caught up to 12 cars that haven't had a chance to get off the offramp, yet. The amount of traffic on said ramp is only going to vary based on the time of day and some dumb luck.