TOD, you know 'em. You're driving in the left lane, you've got some spacing between you and the car in front of you; at most three car lengths, probably less, but you're not tailgating either. Right lane has traffic as well that the cars in the left lane are slowly, but surely over taking. So if I've hopefully created the scene accurately enough so you could basically say it's not rush hour, but you've got some traffic to deal with. Well, here comes a guy passing the car behind in as he moves from the left lane over into the right lane. This is the guy who treats a drive to the grocery store like the Daytona 500. You're on pace to over take the next car in the right lane, but Dale Jr just has to jet up to that car's bumper so he can fit into that space in front of you that gives him about one foot of clearance. Objective achieved: he'll get to Piggly Wiggly 4 seconds sooner. Only 12 more of those and you'll be almost one minute ahead of schedule.