They're useless. Either it's dark enough to need your lights on, or it isn't
My irritations.. I don't honestly know where to start. It'd be easier to say what doesn't irritate me. But I'll have a go:
As said, people sitting at traffic lights with their foot on the brake in their brand new Mercedes with ridiculously bright rear lights.
People who approach traffic lights / traffic, slow down practically to a stop 2 car lengths from the front of the queue and then slowly creep forward. Argh.
People who follow someone so closely in traffic that they're constantly on the brakes, off the brakes, on the brakes, off the brakes, on the brakes, off the brakes. Just hang back a bit!
People with no observational skills who only see about one car length directly in front of them. People utterly oblivious to things such as motorway slip roads and don't give way to a stream of traffic entering the motorway when there is obviously plenty of opportunity to do so, or on the flip side, people who dribble along the slip road at 40mph.
People who don't know how wide their car is.
People who indicate around parked cars and cyclists.
People who drive unnecessarily slowly for the conditions.
Citroen Xsara Picassos.
Vauxhalls.
Lane hoggers. And people who brake on the motorway. Obviously the exception to this is if everyone is stopping or there is a hazard, or someone in a white Audi has just carved you up.
White Audis.
Motorway matrix signs that say "FOG" when the fog is so thick you can barely read the sign. Cheers.
Poor road planning. Shrubbery right up to large roundabouts, for instance. I know the idea is to make it 'safer' or some nonsense, but it isn't very efficient or conducive to good traffic flow. It's no wonder people don't know how to anticipate a gap and just come to a near stop on any roundabout regardless of whether it's 3am and there's no cars, or not. Pedestrian crossings in silly places, like on the sliproads from roundabouts onto motorways/dual carriageways.
Speed bumps.
I'll no doubt think of others as the day goes by.