ABSTRACT
Highway pavement is damaged due to repeated rolling compaction by vehicles so that structural layers are unable to bear the load and various cracks are caused such as fractures, massive cracks, transverse cracks and longitudinal cracks. Crack is the early performance of most pavement crack diseases; so crack is an important index to evaluate the quality of highways [1]. In case cracked roads are not repaired timely, the damage will become increasingly serious on rainy and snowy days and under the action of vehicle load, which can greatly aect the running speed and safety of vehicles. Thus, highway maintenance is of great importance. Presently, manual measurement and analysis are the main methods adopted in our country to detect pavement damages, which can no longer meet the increasingly higher requirements for highway pavement detection [2].
