Hmmmm.. i didnt know that.
I wrote off a motorbike once after it bounced off a crash barrier and destroyed some fencing. I was fine, and noone else involved so left the scene to get a car & trailer to trailer the bike home. I didnt report it to anyone.
Whilst I was off getting a trailer, the Police found the smashed up bike on the grass verge, traced me via the bikes reg number and after spending quite a bit of time contacting local hospitals to see if any injured bikers had turned up, they popped around my house to visit me - by which time id already cleared the bike from the scene.
The police werent concerned at all about the incident or me not reporting it, as noone else was involved - they were just amazed I wasnt injured. However they did say the council might want me to pay for the damage to crash barrier & fence.
But, I never did actually ever heard anything more from the council and so never paid for any of the repairs at all.
Just hope that Council are not checking this forum then!
These days, any chance the highway authority responsible can recover some monies to pay for damage caused by others they will pursue. Part of the reason why we all have to have 3rd party insurance, whether it is damage to life or property.