What is a truck’s “black box” and why is it so important?

A “black box,” or Event Data Recorder (EDR), is a device in most modern commercial trucks that records technical data for a short period before, during, and after a crash. It captures information like vehicle speed, brake application, steering angles, and engine RPMs. This data can provide an unbiased, second-by-second account of what the truck was doing at the moment of impact and is often crucial evidence.