good thing the truck driver was paying attention and had somewhere to go.
my wife agrees with you on the safety blanket aspect of the dashcam... yesterday we got in and the camera said "SD CARD HAS AN ERROR"... tried to format it in-camera and it said it again. apparently the format didn't take. put the card in my phone and deleted a ton of locked files (the cf-100 is very sensitive) and it was happy after that. and of course we did all that in the parking lot before going anywhere.