Just wanted to draw people's attention to this long running project which I feel is useful but obviously the more data the better. The better we understand the impact of road traffic on our wildlife, the more we can fight for safety mitigations.
I think it used to be called Project Splatter (!) but now is has the more sensitive name of The Road Lab and is run from Cardiff University.
https://www.theroadlab.co.uk/
They also have a presence on X.