Insurance companies will need to jump though hoops to access that data in a fender bender where you still have possession of the vehicle. If you provide it (in a dash cam video that's evidence that you shouldn't pay) you're giving them an opportunity to deny the claim right there. There's also a lot of cases where traffic is doing 20-over and 20-25 over is criminal in most states
Almost all modern cars have an Event Data Recorder as part of the SRS/Airbag system which records snapshot data in the event of a deployment. Here are some NHTSA standards for EDR storage: