Cars from BB&L Car Rental are permitted to travel in Umweltzones in Germany. This does, however, require an environment sticker. You can purchase this sticker, on which the car registration number must be displayed, from the larger petrol stations in Germany. In some countries, you are required to drive with snow tyres in winter conditions (e.g. Germany, Austria). Allow yourself sufficient time to research the local legislation in the countries you plan to visit during the car rental period.