According to the latest standard GB/T 3730.1-2001, cars are mainly divided into passenger cars and commercial vehicles. Network planning technology is a scientific method of planning and management, which is developed with the development of modern science and technology and industrial production. In the 1950s, in order to meet the needs of scientific research and the management of new production organizations, some new methods of planning management were introduced abroad. In 1956, dupont studied the key line method of network planning technology (CPM) and tried it on a chemical engineering project, and achieved good economic results. In 1958 the United States naval weapons when "Polaris" missile plans, applied the plan evaluation method (abbreviated as PERT) project plan arrangement, evaluation, audit and control, was a huge success. In the early 1960 s, the network planning technique, has been in the United States all new construction fully adopt this kind of new method for program management, could be introduced into Japan and Western Europe and other countries. With the rapid development of modern science and technology and the continuous improvement of management level, network planning technology is also developing and improving. At present, it has been widely applied in the fields of industry, defense, construction, transportation and scientific research of the world, and has become a scientific method of modern production management in developed countries. Lay the foundation Phoenix iMarkets compiled from ZeroHedge, according to government data compiled by Labyrinth consulting services, the growth trend of U.S. personal vehicle mileage (VMT) has been steady since June 2017. The possibility of a halt to growth in U.S. personal vehicle miles (VMT) has been around since the start of 2014, which could signal a slowdown in crude oil consumption. Julie Palmer, a retail expert at Begbies Traynor, said retailers faced a particularly disappointing deal in the weeks following the apparent success of "black Friday" at the end of November.