Are you a bored HGV driver on the M25?
Well, you can make everybody's day by overtaking the 40 tonner in front who's speed limiter is set at 0.5mph slower than yours.

Throw in a few steep hills to make it more interesting and bingo! Queues of agitated motorists with nothing else to look at but the arse-end of your lorry for the next sixteen miles.
(Bicycle Repairman "you're also a bit of a wanker", Wed 13 Dec 2006, 13:19, Reply)