Transportation with the road as its core is a vital foundation of the national economy, and it is the pre-condition for the expansion of re-production and the development of commodity economy, which play a very important role in promoting national economy and social develop Transportation with the road as its core is a vital foundation of the national economy, and it is the pre-condition for the expansion of re-production and the development of commodity economy, which play a very important role in promoting national economy and social develop