See that little green display with a red dot underneath in the lower left of the picture of a car dashboard? It's a tailgating meter from the insurance company. It shows beeps and red below the number because, at the moment, the (taxi) driver is tailgaiting. When he gets really close, the beeps get angrier.
This is an example of one of a number of insurance-imposed sensors on the car. Others include "dash cams" above the rear view mirror, one pointing forward and one pointing backwards. In the event of an accident, the insurance company will have full telemetry to know precisely who is at fault.
As such sensors continue to plummet in price, they will will be standard equipment on cars -- not just taxis. If your car doesn't have one, you will likely pay higher rates.