Think its frustration, I really think cyclists should not be on the roads, you can't mix fast moving vehicles and large lorries with a flimsy piece of metal with no protection, the only result is death!
What the country needs is cycle highways to enable cyclists to get around safely and unhindered, I find cycling on London roads very dangerous, mainly because of the amount of drivers with no licence and insurance who just take the **** as nothing ever gets done, vehicles are poorly maintained and a lot unroadworthy.
I have travelled the world extensively, driven and been driven in these countries where standards are abysmal, a driving test involves driving around a few oil drums, unfortunately these people can drive in the UK legally and more and more are arriving, so things are only going to get worse!
Cyclists getting killed on London roads is not rocket scientist, lorries need to get into London to keep the city supplied, London draws huge amounts of tourists, businesses and the likes, all need supplies, having cycle next to a huge articulated lorry or anywhere near it is asking for death at some time, so I am never surprised when it happens, YOU CANNOT MIX THE TWO! So what is more important, a cyclist or supplying a city? but I refer back to my safe cycle only highways.
I love the South of France, fantastic cycle routes and I am out most of the day, here in London its a game of keep alive, not fun really and extremely dangerous as car thunder past almost brushing my elbows! Can't blame them though as they are trying to get on with work and the pressures that entails to keep a job nowadays, I'm retired and have all the time in the world.