Plan your route with Google Maps, Bing Maps or any route planning service.
All vehicles, which enter the environment-zone (or green-zone), have to have a special environmental sticker (Umweltplakette), which should be ordered in advance. Further information: http://www.german-way.com/travel-and-tourism/driving-in-europe/driving/driving-in-germany-green-zones/.
The easiest way to get your Umweltplakette is from the TÜV, either at a local inspection station or online at www.tuev-sued.de (south) or www.tuev-nord.de (north). Both sites have English instructions. You will need your vehicle emissions key number (Schlüsselnummer). An environmental sticker is valid for the life of the vehicle.
Cost:
Vehicles registered in Germany: €6.00 (incl. VAT)
Foreign vehicles: €12.50
Order Online (TÜV) – English instructions for ordering your environmental sticker from TÜV
Toll on motorways will NOT apply for vehicles under 7.5 t.
Information on toll & payment methods here: https://www.toll-collect.de/de/toll_collect/rund_um_die_maut/mautpflichtige_fahrzeuge/mautpflichtige_fahrzeuge.html