A couple of walks in the nature reserve have yielded huge numbers of birds and informative boards telling us about bats, and other wildlife. Bats shelter under this bridge, which we presume is largely undisturbed as the traffic is very specifically restricted. What about a small van, an ambulance, a tractor and trailer, a herd of cows? This road leads to a field of cows from a private road so not much tests its strength. There is path along the river under it.