A tank truck or tanker truck is a motor vehicle designed to carry liquefied loads or gases on roads. The largest such vehicles are similar to railroad tank cars which are also designed to carry liquefied loads. Many variants exist due to the wide variety of liquids that can be transported. Tank trucks tend to be large; they may be insulated or non-insulated; pressurized or non-pressurized; and designed for single or multiple loads. Some are semi-trailer trucks. They are difficult to drive due to their high center of gravity.
Due to the high compression ratio of gas to liquid (600 to 1), transporting LNG is the most common, cost effective means of mass distribution of natural gas into stationary storage tanks for further distribution. LNG transport from a central liquefaction plant to areas where no pipeline and gas grid exist creates a virtual pipeline that enables natural gas to displace traditional and more expensive fuel options, such as LPG and diesel, for a variety of residential, commercial and industrial applications.