ABSTRACT
Bridge Weigh-in-Motion (B-WIM) systems have become increasingly popular in Indonesia due to their ability to measure the weight and axle load of vehicles without the need for them to stop at a weighbridge. As a permanent and reliable system, B-WIM has been installed in several locations throughout Indonesia for over three years. The purpose of this research is to assess the accuracy of the B-WIM system in various locations and identify the factors that influence its precision. The study utilizes the calibration procedure outlined in the COST 323 standard for accuracy assessment. Ten bridges were calibrated, with five of them undergoing recalibration after years of operation. The results show that B-WIM systems generally provide high accuracy in measuring gross vehicle weight (GVW). However, the accuracy of axle-specific weight measurements was found to be relatively lower. The relationship between bridge types and accuracy classes was explored, revealing that short-span girders, both steel and precast concrete girders, exhibited high accuracy levels when the pavement condition was well-maintained. Recalibration was found to improve accuracy, except for one site with a longer timespan between calibrations, possibly due to pavement deterioration. The findings highlight the importance of maintaining pavement conditions to minimize dynamic effects on B-WIM measurements. Managerially, this research provides valuable insights for transportation authorities in Indonesia to identify areas for improvement in the B-WIM system and ensure reliable and precise measurements for various purposes, including overloading law enforcement and bridge condition evaluation.
