ABSTRACT
The objective of this study is to analyze the effectiveness of overweight enforcement system using a high speed weigh-in-motion (HS-WIM) system on mainline of expressway in Korea to control the overweight trucks. In an earlier study, it was proved that the HS-WIM system has an appropriate weighing accuracy to analyze the weight distribution statistically. In this study, the HS-WIM system was used to estimate the truck weight according to the European Specifications (COST-323) and the ASTM Standards (E1318-09) for the WIM. Two overweight enforcement systems were operated on mainline of two expressway routes for two months to provide the weight configuration of the overweight vehicle in real time to the enforcement squad. Traffic volume, gross vehicle weight (GVW) and axle weight of freight trucks for two months were collected before and after the enforcement system was operated. Two-month data of two periods were compared to evaluate the effectiveness of controlling the overweight trucks. Results show that both layouts were acceptable for the use of the enforcement system, and they were ranked at A (5) and Type III according to COST-323 and ASTM E1318, respectively. After the enforcement system was operated, the rate of overweight trucks has been decreased by 27% compared with the rate before the enforcement system. Especially, the rate of overweight trucks over 48 tons has been decreased by up to 91%. In contrast, the rate of trucks under enforcement limits has been increased by 7%. Although it needs a long-term monitoring to evaluate the effectiveness of the overweight truck, it can be preliminary concluded that the proposed enforcement system using HS-WIM in different layouts is an effective and efficient system to control the overloading of the freight truck. Changes of overweighted vehicle rates with enforcement. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig137_1.tif"/>
