ive never been in an accident or had any driving related citation ... my record is clean
ive been in an accident while extremely fucked up, entirely my fault and drove off however
yes that happens quite often. especially in cali for some reason. alot of big rigs put personal cameras up, most companies do this as well. also records distance speed g force etc etc. in the case of a car quickly entering your lane cutting you off and slamming brakes..your 80,000lb truck has no chance.. your lawyer can get you out with these devices
other than that a yes, your fault. Brake check, still your fault though he can get charged as well.
an unavoidable accident still goes on record