I think the whole parking sensor systems moving to the mid-range has probably happened too recently to be widespread at this point, but I imagine that depends enormously on affluence. There's a big difference between people who buy a mid-range/family car, and the people who replace it every few years.

It's a neat idea though, and if it is already on higher end models it'll probably trickle down eventually. Eliminating blind spots seems obvious - I imagine check the blind spot before moving is one of the first behaviours people lose after passing their test. I very rarely see drivers do it.

> I think it should be a legal requirement on all busses and HGVs - the single largest cause of accidents between cyclists and vehicles.

Do you have a link for this? It seems hard to believe given how relatively low the numbers of those vehicles are. Rospa [0] say it's cars or taxis which I'd have expected, although they do point out 20% of fatalities in London involve an HGV - and say one quarter of serious injuries are a bus/HGV (as you'd expect, performing a left turn). So more than I'd have guessed, but I'm not sure about the single largest?

For what it's worth they also say 75% of accidents happen at or near a junction which matches pretty well to your observation of lights/slow moving traffic.

[0] http://www.rospa.com/road-safety/advice/pedal-cyclists/facts...