As soon as car manufacturers implement dash cams, government will regulate it to require that it records the speed of the car as well, which I think owners will hate and make them want to avoid those models of cars. I think it's gonna end up as damned if you do, damned if you don't situation.
You car already records your speed. It's not stored forever, but in the event of a crash your last X seconds of speed, throttle, brakes, steering, and more are being stored in a rolling buffer
Google Maps records everything and sends it to the cloud to log your entire journey while using the app. They've made it into a feature to show "average speed" and similar details in the Maps app.
They have your speed, where you began and where you were going. Way more damning.
Without government influence, auto manufacturers already have "black boxes" that record speed and other telemetry. I'm very conscious of the erosion of privacy, but I'm a 40-something computer nerd. People actively, deliberately record themselves doing crimes of all stripes and post it to public social networks.
In the states, there's rampant violation of vehicle-related laws and minimal enforcement (fake temporary tags, deliberate obstruction of real license plates, deeply tinted windshield and driver/passenger glass, not to mention rolling stops and speeding)
Modern cars record their speed today, no one bats an eye. Even before in-car tech could do this, you could passively enforce speeding by using toll booth data, but that doesn't happen. Neither side cares enough to bother.
If you have the app for your auto insurance on your phone, they are probably attempting to track your "misbehavior" through that, in the same way they do with their offerings that use GPS enabled ODBII dongles. Unless it is explicitly, extremely illegal in an execs go to prison kind of way, they will do it.
