A tank truck or tanker truck (US) or tanker (UK), is an electric motor car made to bring dissolved loads, completely dry bulk freight or gases on roadways. The biggest such cars are comparable to railway tank vehicles which are likewise made to lug dissolved loads. Several variants exist due to the wide range of fluids that could be carried. Tank vehicles have the tendency to be big; they could be protected or non-insulated; pressurized or non-pressurized; and also developed for solitary or several loads (commonly by methods of inner departments in their tank). Some are semi-trailer trucks. They are challenging to drive as a result of their high facility of gravity.