I applied for a job with a company that hauled diesel fuel out to the Coal mines here in the Bowen Basin they have camera's in all their trucks as a safety precaution the cameras are only activated under heavy braking.
Heavy braking and acceleration. Ours are so sensitive that they kick on when we’re bobtailing and using the jake. Also when too heavy on the throttle. Another tattle tale device for guys who don’t drive like senior citizens.