The transport of compressed hydrogen by road or rail is currently the most widely used mode of hydrogen transport. Hydrogen is transported in pressurised containers at a pressure of 200 bar (defined by the Agreement on International Carriage of Dangerous Goods by Road – ADR) [19] For an example of the use of hydrogen and petrol transport by truck, we can use the comparison published in the "Hydrogen Strategy of the Czech Republic". The same truck carrying compressed hydrogen can transport 500 kg of hydrogen (in cylinders at 200 bar pressure). This is because the cylinders have to withstand very high pressure. A truck with hydrogen weighs almost the same as a truck without hydrogen, the only difference is the 500 kg. The compressed hydrogen tank is robust. Because of the low amount of hydrogen transported in a single trailer, this method of transport is only economical up to a distance of around 150 km. [19] When transporting compressed hydrogen by road or rail, there is no need to build a transport infrastructure and the amount of hydrogen transported can be dosed appropriately. For the final distribution of hydrogen, transport containers can be used as mobile storage tanks for filling stations, thus eliminating the need to pump hydrogen into the filling station's storage tank. The disadvantages are the limited distance, especially in the case of road transport, and the risk of accidents. [19]