Weigh-in-Motion (WIM) is a technology for measuring the weight and speed of trucks as they move along roads,  without requiring them to stop. Highway WIM systems are used for collection of statistical traffic data, support of commercial vehicle enforcement, roadway and bridge cost allocation, traffic management, etc. Fiber-optic sensors have several advantages over existing systems and can extend the range of applications to real-time safety and security systems for national and homeland security needs. Optical solutions are not affected by electromagnetic interference (including lighting strikes), they can withstand harsh environments, and they have low power requirements. Highway system managers and transport companies will both benefit from fiber-optic sensing technology. Truckers  won’t have to stop to provide vehicle weight information, and can complete their routes more quickly. Highway enforcement agencies will be able to determine vehicle weight information using fewer resources.

Installing sensing system in-ground sensors	Field installation
Actual field weigh station	Actual read out of two axial vehicle weight indication