'Or the ones in 30 zones that ride in the middle of the road, making them impossible to overtake, because they mistakenly believe they are doing at least 30... So it's okay for all the drivers to sit behind them. Often wearing head to toe Lycra and going downhill. I want to scream out of the window: "You are only doing 20 - MOVE TO THE SIDE".'
Oh do fuck off.
I was walking down the street earlier, and I saw a cyclist. He was kitted out and competent, but on a narrow town centre road he was cycling in the left of the lane.
I wanted to shout at him "MOVE OVER!".
He left enough space for a car to pass, which it did too close for comfort. Behind this was a large truck, which clearly though about doing the same, but thankfully thought better of it.
150 yards down the road is a red light, 100 yards beyond that another, then a third.
The best thing for him to have done would be to cycle in the middle, or slightly to the right of the middle of the lane, because that would have prevented a completely pointless overtake by the vehicles behind and enhanced his safety.
Moving on to your comments, a 30 zone does not mean that you must do 30. 30 is the MAXIMUM.
The reality is in many 30 zones the actual average speed taking into account congestion etc. is about 10mph. So a cyclist might well not get beyond 20mph, but they are still making better progress than you, so it's you that's holding them up, not the other way round.
I'm not sure what their choice of clothing has got to do with anything, but if they are going downhill they obviously need more space because they are likely to wobble/weave, so it's a good idea for them to make it impossible for you to pass, because there's not room for you to do so safely, especially if the downhill is sweeping and considering the state of many road surfaces they may have to take evasive action to avoid potholes, slippery drain covers, etc.
It's likely that they have a better awareness of their speed than you of yours, but that does not make you more important than them!
I was driving through a town centre a while ago. Typical stop-start traffic, a cyclist was there, not very fast, but she had past me a couple of times in traffic, and I didn't see the point in hurrying past very close (she was cycling virtually in the gutter), so I waited for a gap in traffic coming the other way before passing. The car behind me didn't like this and beeped his horn at me, so I just slowed down even more.
Fact was the cyclist was holding up nobody. All the damn motorists in their cars were the problem. YOU are the traffic. Not cyclists.
The only problem is with selfish motorists who see a bicycle in front of them and demand they get the fuck out of their way because the motorists are so fucking entitled they think the cyclist is poor and inferior (I was told this by a Range Rover driver once, he assumed I must be poor because I was on a bicycle, er no, I have a very nice car thank you, I just prefer to ride my bicycle most of the time) and a second-class citizen.
How about you just watch some of these 30mph zone cyclists a bit more carefully and consider that their right to life is a lot more fucking important than your desire to get to the next set of traffic lights a bit quicker, and notice that in fact they are making better progress than you are, in spite of your big polluting engine making you quicker on the open road.