公路是汽车运输的首要条件。公路路况的好坏直接影响着汽车的效率和使用寿命,并与运营费用有着密切的关系。公路在使用过程中,受到行车和自然力的作用不断损坏。因此,必须及时的养护修理,以保持设计时的状况。其养护管理所投入力量的多寡,直接影响着公路的质量,对此国家将其划分为四个等级(即路况等 Road is the first condition of motor transport. The quality of highway traffic directly affects the efficiency and service life of the car, and is closely related to operating expenses. Road in use, by the role of driving and natural forces continue to be damaged. Therefore, maintenance must be promptly maintained to maintain the design of the situation. The amount of energy invested in conservation management has a direct impact on the quality of roads, for which the country divides them into four levels (ie, road conditions, etc.