Legal side note: Germany also has a vehicle tax that roughly scales with the size of the vehicle. But this only applies to vehicles registered in Germany. Because of the European Single Market, a lot of trucks running on German highways are registered in foreign countries (esp. Eastern Europe since drivers from those countries draw smaller salaries). The toll was enacted specifically to ensure that those foreign trucks contribute towards road maintenance as well. It does apply to German trucks, too, because the EU has rules against laws that discriminate against foreign EU citizens.