There are over eleven million road vehicles worldwide that run on natural gas as a fuel.
The gas is used in a liquefied state to power taxis, cars, buses and trucks.
Existing gasoline-powered road vehicles can be changed to run on CNG or LNG, and may be dedicated (running only on natural gas) or bi-fuel (running on either gasoline or natural gas).
But, an increasing number of road vehicles worldwide are being manufactured to run on CNG.
A natural gas vehicle is other fuel vehicles that use compressed natural gas (CNG) or liquefied natural gas (LNG).