Another perspective perceived safety. Does anyone recall the QI episodes regarding safety - that if you want to increase safety, perversely you should make something more dangerous. Research shows (I don't like the phrase, but here a valid point is made) that if you want to make a junction safer, make it more complicated - you increase the singeage, make it a slight bend, lots of slightly confusing traffic signals, filter lights, etc. If it's a perfectly easy-looking junction where you can barrel through at speed without really paying much attention by the time you realise that actually you just missed that solitary red light, it's too late, type of thing.
Roofer/chippy I know says he's had more 'near misses' and trips etc with the safety harnessing and so forth when working on roofs than ever before; he used to hope between joists and over sheer 50ft drops like there was no tomorrow. Because it's dangerous and if you know that one slip and you'll plummet to your death, your natural instinct just keep you safe.
Basically bringing me to this simple point. In 1990-5 pre-NCAP days if you wanted a safe car, buy a Volvo/Saab. then there was a few makes such as Vauxhall who sold their cars with Airbags, pretensioners and side impact door beams, ABS, then there was everyone else. If you drive a tin box AX/Metro/Micra etc and you drive at 70 down a winding country lane and you hit that tree, you WILL DIE- SO DON'T. Now, you're in your 5-star NCAP rated supermini/Megane or whatever, you've got 10 airbags, EBD, TC, highly advanced safety cell and crumple zones and all manner of things that will save you.....so you think. Well, no. Designing cars 'safer' is simply raising the speed of which you can drive, and giving a larger margin of error for the moron to drive like an idiot - as said 'I'm all right in my safe car - sod everyone else' attitude.