Sometimes I pick a car in the next lane to track and compare my progress with. Although one of us will sometimes leave the other behind for a few minutes, usually we return to rough parity eventually.
Back when there were tollbooths where you had to pay cash, I remember seeing aggressive lane-changers, tailgaters, etc. pass by and then seeing them waiting in line, having gotten no further than us, at the toolbooth.
Sometimes I pick a car in the next lane to track and compare my progress with. Although one of us will sometimes leave the other behind for a few minutes, usually we return to rough parity eventually.