From 1 January 2019, trucks equipped with CNG (Compressed Natural Gas) and LNG (Liquefied Natural Gas) engines will be exempted from tolls in Germany.
This aid will be applied for two years and the economy will be substantial since it represents almost 19 000 € for a truck of 40 tons traveling 100 000 km (in comparison with a diesel engine Euro 6).
For the moment only trucks registered in Germany are concerned but soon foreign trucks will benefit.