People who hog the middle lane on motorways or tailgate other drivers could be fined £100 if they are spotted by police.
Until now this type of careless driving has gone unpunished because it is difficult to take the cases to court. The authorities hope that on the spot penalties will be enough to encourage motorists to drive more considerately. Kate Bunkall has been looking at the problem.
More top news
Gravitational waves - ripples in spacetime - have been detected by scientists a century after Albert Einstein predicted their existence.
Reading host Burnley in the Sky Bet Championship on Saturday
Brighton host struggling Bolton Wanderers at the Amex Stadium on Saturday.