High Speed Weigh In Motion systems are installed in the main highway and weigh vehicles at normal highway speeds (20-120 kph) but will detect, count and classify vehicles from 5 kph to 200 kph. Accuracies to COST 323 Class B(10); +/-10% (or better), are achievable on well constructed roads. The Weigh In Motion system uses unobtrusive but easily installed piezo electric sensors as the weighing medium.
TDC have a number of bespoke High Speed Weigh In Motion solutions; the HI-TRAC 100+ is our main system with a long and excellent track record in installations worldwide. The HI-TRAC 100+ system can connect to 8 lanes of WIM sensors however smaller systems with limited connectivity are available. The HI-TRAC EMU2 is the second generation of our popular high speed WIM and counter/classifying system; the EMU2 can connect to 2 lanes of WIM sensors.
The Roadtrax ® BL piezo electric sensor is manufactured for TDC by Measurement Specialties Inc and is available to Class 1 or Class 2 specifications. Class 1 sensors are used for WIM; these sensors produce a close tolerance output throughout their length. Sensors are available from 2M to 5.5M; covering most applications and lane widths.
