Switzerland is the only European country where road user charges that internalize external costs of transport are applied. The scheme involves a per km charge for all heavy-duty vehicles on all Swiss roads.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/switzerland-has-been-charging-seven-years
[2] http://admin.indiaenvironmentportal.org.in/category/journal/acid-news
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/road-pricing
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/switzerland