It may also be the problem of cruising range and refueling speed. The temperature of CNG is low, the pressure is not enough, and the refueling line is long. Some people even get up in line late at night. The South-to-North Water Transfer Project can be carried out, as can the West-to-East Gas Transmission Project, but the efficiency, quantity and cost of gas transmission are far greater than that of infusion. Therefore, CNG is generally used in areas with rich production areas and areas that can be transported over short distances. In terms of safety, CNG cylinders have passed the test of fire and shooting. As long as the annual inspection of qualified gas tanks, it is almost impossible to explode (with burning CNG vehicles), and the safety of liquefied petroleum gas tanks under extreme conditions is slightly worse.