The United States State Grid is known as the "Interstate and National Defense Highway" (all highway), funded and managed by the federal government, and the specific conservation work entrusts the state and local highway sectors. Road maintenance is not divided into highway grade boundaries, according to AASHO maintenance manual, maintenance management agencies and conservation operations institutions are set by geographical or administrative areas; on the toll road, its setting must be through the state legislature franchise legislation, the legislative provisions include not only The establishment of the agency, business scope, duration, but also on the collection of funds, the use of funds, maintenance and maintenance of the responsibility to do a detailed provision. The management agency generally contracted the conservation works to the private maintenance company. According to AASHO's "Member Organization Site Contract Maintenance Profile" and "Typical Contract Maintenance Works and Various Scope and Unit Costs", the management agency is responsible for the contractor as the owner Of the negotiations, and supervise the implementation of the contract acceptance work. The organization of the conservation company fully takes into account the distance and the time factor of the maintenance site, and fully embodies the characteristics of technology-intensive in personnel and equipment configuration. All operations mechanization, technical staff and skilled workers skills cover all aspects of conservation operations. road pavement construction steps why we use vibrator in concrete comprehensive repair material company concrete pavement milling machine