Embedded Files
Weight in Motion (WIM)
Weight in Motion (WIM)
Weigh in Motion (WIM) systems measure and record data from passing vehicles. These records are used for count data, traffic statistics and calculating road, tunnel or viaduct maintenance factors. This system can be expanded with cameras to capture and present the vehicles that are heavily loaded. A WIM system per lane is provided with a vehicle detection system and an axle load measuring system. These systems are able to register vehicle information like speed, length, axle loads and total loads
The WIM-FO (Weigh in Motion Fiber Optic) sensor is based on optical fiber technology (Fiber Bragg Gratings) for pressure measurements (weight). The sensor contains no electric circuits and needs no power supply. Therefore optical sensors are not influenced by electromagnetic radiation. The sensor is placed 2 to 9 cm below the surface of the top asphalt layer and connected with a read-out unit (interrogation unit) through a fiber optic cable. The interrogation unit supplies the measurement values to a computer, which analyzes and determinates the footprint (weigh and surface of all the wheels) of the passed vehicle. The read-out unit can be placed for example near the sensor along the roadside or some kilometers from the measurement point. For either option no additional equipment between the WIM-FO sensor and the read-out unit is needed.
WIM-FO system provides information about:
- Transport movement
- Traffic flow
- Traffic density
Report abuse