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This is a used ETC system using radar (black cylinder at left) to measure ground speed to calculate wheel slip. The cylinder is mounted with line-of-sight to the track surface. Sensor-based ETC units like this are harder to mount to defy detection, just because of the number of parts and wires.
The Electronic Traction Control Genie

 This is a used ETC system using radar (black cylinder at left) to measure ground speed to calculate wheel slip. The cylinder is mounted with line-of-sight to the track surface. Sensor-based ETC units like this are harder to mount to defy detection, just because of the number of parts and wires.  View Related Article

 

 

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