I used the type that plugs into your car's ODB port. It was required for a time period, which I think was 6 months. At that time, I was deemed a safe driver and no longer required to use the device. I then received a discount which I've maintained for years, so it was worth it. Agree that it was a pain in that hard breaking to avoid an accident or changing lanes quickly because an emergency vehicle was on your tail, would ding you. But you were allowed a reasonable number of offenses w/o being deemed an unsafe driver. It was a huge relief when the 6 month period was over and I could resume my normal driving, which would be considered unsafe by the device, yet I've never been in an accident.
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