A sensor node equiped with magnetometer HMC1051Z was used to collect the z-axis measurements of trucks from the 880 weigh station at Fremont, CA.
Moreover, a video camera had been setup to record the whole experiment. So that it can act as a ground truth for truck classification. A total of 83 trucks were recorded with the sensor node placed along the middle of the lane, while there were another 94 trucks recorded with the sensor placed at a known offset from the middle.