Well .... I'll have to correct myself. The previous images I took were from a driving car and
very unfocused and/or my hazy memory is playing weird tricks on me....
Stopped today to take a closer look and it seems it's not some wires and stainless steel reflecting surfaces after all, but mostly plastics
Oh well, here are our Dutch
"Wildspiegels" - made in Germany
On the original subject: Wikipedia actually has fairly good articles about those:
Ecoduct (NL),
Wildlife crossing (EN) (and other languages - often including lists of places where these are constructed).