交通荷重為影響鋪面績效的重要因子，國內量測交通荷重主要仰賴靜態地磅站，引導重車進入磅站量測總重，但交通尖峰時期，開磅容易引起車輛回堵，阻塞主線道。民國108年交通部高速公路局於國道1號岡山交流道北上路段，首次建置主線篩選式動態地磅(WIM)系統，協助地磅站過濾篩選，改善開磅造成之車流影響，同時紀錄所有行經車輛之軸重資訊。本研究依據高速公路局提供之動態地磅紀錄資料，分析動態地磅設置前後之交通荷重變化情形，並以力學經驗鋪面設計觀念，評估不同交通荷重條件下之鋪面績效差異，進而結合生命週期成本分析方法，探討交通荷重與養護成本之關聯性，將提供道路主管機關相關重車管理建議。研究成果顯示，因載重與交通荷重約成四次方相關，故卡車、聯結車成為交通荷重主要考量因素，且靜態地磅站執法及動態地磅之設置，皆可有效管控重車超載行為，另因取締寬容值、臨時通行證等行政作為而額外增加之交通荷重，則對鋪面績效產生甚鉅之影響，進而使刨鋪頻率增加，徒增巨量之管理養護成本。

Traffic load is an important factor that affects pavement performance. Domestic measurement of traffic load mainly relies on static weighing stations to guide heavy vehicles into weighing stations to measure total weight. However, weighing can easily cause vehicles to jam and block the main line during peak traffic. In the Republic of China, the Freeway Bureau of the Ministry of Communications built the Weight-in-Motion (WIM) system for the first time on the north section of Gangshan Interchange on National Highway No. 1, to assist the weighbridge station to filter and screen the improvement of the impact of traffic flow caused by weighing, and record the axle weight information of all passing vehicles.This study analyzes the changes of traffic load, the record data provided by the Freeway Bureau, before and after the WIM seting. The study uses the mechanical experience pavement design concept to evaluate the difference in pavement performance under different traffic load conditions, and then combines the analysis method of life cycle cost to discuss the relationship between traffic load and maintenance cost, finally provide relevant heavy vehicle management suggestions for road authorities. The results show that the load and the traffic load are approximately related to the fourth power, so trucks and connected vehicles have become the main considerations for traffic loads. The law enforcement of static weighbridge stations and the setting of WIM can effectively control the overloading behavior of heavy vehicles. The additional traffic load caused by administrative actions such as the ban on tolerance values and temporary passes will have a huge impact on the performance of the pavement, which will increase the frequency of paving and increase the cost of management and maintenance.

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