Kerbstones tend to be permanent, linear devices with a defined position relative to the pavement/road interface. Hence easily anticipated and negotiated.
I do accept that it is possible to fall off one when blinded after walking into a near-invisible tyewrap pointing straight at you. It would...
Is it just me or is anyone else peeed off by tyewraps used to fix notices to posts being left with the redundant pointy bit sticking out at eye-level?
This even applies in southern Oxfordshire to official planning notifications. Have the people putting them up not heard of scissors or other...