Driving too close, dawdling in the middle lane and cutting in at the last moment are in the frame but apparently they're not the worst.

According to a poll of BBC TV Top Gear viewers, an inability to take the correct line at roundabouts incenses drivers more than anything else.

Frankly, I don't believe it though perhaps those who watch the programme really are concerned about the finer points of road craft and are not simply ogling the latest Ferrari or Lamborghini.

Of course, I haven't conducted a proper poll but the over-riding mistake people mention to me is the stupid and highly dangerous act of driving too close, especially on motorways.

That mistake is easily remedied - you simply ease off the accelerator and drop back - but tackling a roundabout takes up two pages of text and illustrations in the new Highway Code.

If you are one of the two million people who bought the code within three months of its publication, you will have checked on roundabouts, which terrify L-drivers early on because of their complexity.

Unless signs or road markings indicate otherwise, the Highway Code says:

* When turning left signal left and approach in the left-hand lane; keep to the left on the roundabout and continue signalling left.

* When going straight ahead do not signal on approach; approach in the left-hand or centre lane on a three-lane road (on a two-lane road you may approach in the right-hand lane if the left-hand lane is blocked); take the same course on the roundabout; signal left after you have passed the exit before the one you want.

* When turning right or going full circle signal right and approach in the right-hand lane; keep to the right on the roundabout; continue to signal right until you have passed the exit before the one you want, then signal left.

The advice adds: "When there are more than three lanes at the entrance to a roundabout, use the most appropriate lane on approach and through the roundabout.''

There is other general advice, such as reducing your speed, but we all know a sports car hotshot who views a favourite roundabout as a personal chicane (though always when the road is deserted, of course).

The Code warns drivers to take special care to watch out for cyclist, horse riders and long vehicles. And remember the same rules apply to mini-roundabouts.

Top Gear says viewers voted second in unpopularity those who drive with their rear fog lights blinding following drivers "at times when visibility is well above the 100 metres (328ft) laid down by the law''. Yes, really.

Third worst offenders were judged to be those queue jumpers who ignore signs telling them that in one mile their lane will be closed and then cut in front of law-abiding drivers who positioned themselves correctly. That criticism has my full backing.

Fourth (of 10) faults was the motorway "middle lane sitter'' who ignores the Highway Code advice to "keep in the left hand lane unless overtaking''.

They irritate me, too, because of the temptation presented to following drivers to stay in the nearside lane to overtake or to flash headlights before they move over.

Ted Clements, chief examiner of the Institite of Advanced Motorists, said: "These examples of undesirable road behaviour stem from two basicsources - a prevalent lack of common courtesy on our roads and thought for others; lack of knowledge of the Highway Code and failure to leave a margin of error.''