To protect myself, I just bought this. Amazon.com: GS8000L Car DVR 1080P,HD Black Box Traveling Driving Data Recorder Camcorder Vehicle Camera Night Version Dashboard Dash Cam With 120 Degree Angle View Black,Come with 16GB TF Memory Card: Car Electronics
$35 thru Amazon Prime is hard to beat. The instructions seem like they were written by a Chinese 1st Grader, but you can figure it out in a few minutes. My only complaint is that the battery is only good for about 20 minutes, thus, it has to live on the power cord.
It appears to loop and overwrite the mini SD card about every 10 minutes, so not an item for documenting your trip, merely an accident recorder.