I own two horses. I rent the paddocks from a farmer. To leave the paddocks we have to ride or lead the horses down a short residential lane, a no through road of about 5 houses. I've been doing this for about 12 years, all works well, the locals like the horses, everything is very friendly.
About a fortnight ago I noticed there was a scattering of tiny pieces of broken glass along the road. I came back with a dustpan and brush and swept it up. All fine, I presumed it had been dropped by a recycling truck or something. Anyway, today there's more. It's quite finely crushed and there is quite a lot of it. I'm beginning to feel a bit worried as obviously if the horses tread on it it could be extremely serious and expensive!!
I don't want the neighbours to think I am being accusatory so what would you do?