It is part of the EU regulations to have them in Europe when you build or modernize highways. This is to prevent the isolated islands for animals (at the moment

It is part of the EU regulations to have them in Europe when you build or modernize highways. This is to prevent the isolated islands for animals (at the moment Belgium is the most fractured land in EU). In France, I even spotted one for bats! http://france3-regions.francetvinfo.fr/rhone-alpes/2012/11/21/balbigny-une-passerelle-pour-chauve-souris-au-dessus-de-l-a89-148988.html http://france3-regions.francetvinfo.fr/rhone-alpes/2012/11/2...