Quote:
I get the feeling though that if I installed a concrete block around the corner of a hedged country lane 80% of people would simply plough into it, or have to swerve into oncoming traffic to avoid it.
Sadly, I suspect that you are correct. at the very least, One should always drive in a manner that means one would be able to stop safely assuming that there is a broken down tractor *just* round the corner. (My "rule" is more extream and assumes there is a wide vehicle actually coming towards me)
Its the same with motorways, even people who *think* they are leaving a sensible gap are actually reling on braking into the space currently occupied by the car in front. Most of the time this is OK (just like hooning it down country lanes) but in an emergancy it is not! Which is why multiple pileups occur!
In practace you need to allow about 1 second gap/20MPH to be "safe" (more in poor conditions)
The reason why it is dangerous to drive at 60 through a town centre isnt because if you hit somebody you will probabally kill them. it is because, in the enviroment of a town centre, you cannot "see" 3 seconds ahead and therefore cannot have the time to react to emergancies making accedents almost inevitable. (by contrast, on a clear motorway you can, on occasion, *see* 10 seconds ahead or even more)
In a busy town centre, 20MPH is more sensible not because if you hit somebody they have a better chance of surviving. rather it is because you will then have the
time to react to a pedestrian stepping into the road or whatever and
not hit them at all!.
The current message is appallingly wrong.
Safety is
NOT about running people over slowly so they survive
IT IS ABOUT NOT RUNNING THEM OVER AT ALL!