一、引言随着国民经济的迅速发展,运输任务日趋繁重,公路交通和大吨位车辆日益增加,现有公路标准过低和日益增长的运输间的矛盾愈来愈突出。旨在提高现有公路通过能力的技术改造已成为当前公路交通部门的一项十分重要而又紧迫的任务。 I. INTRODUCTION Along with the rapid development of the national economy, the transportation task is becoming more and more heavy. The traffic volume of roads and large tonnage vehicles are increasing day by day. The contradiction between the existing low road standards and the growing transportation has become increasingly prominent. Technical reform aimed at improving the capacity of existing roads to pass has become a very important and urgent task for the current road transport sector.