I would think that any such system (and I have zero experience with any kind of on board detection and reporting systems) would also need to have some type of camera (and maybe an audio track) to verify operator violations.
For instance, suppose 2 trucks fitted with such systems collide. both trucks detectors record the impact. The operator of each truck blames the other. How can a detection system disclose fault or blame?
I may have just revealed the scope and depth of my ignorance here.