An 80,000 pound semi truck isn’t a sports car. It’s designed to haul freight while handling is a secondary consideration. This leaves truck drivers with few options in emergency situations. They can hit the brakes and possibly not stop in time, or swerve and possibly rollover or jackknife their rigs. In spite of these handicaps, some truck drivers depower the brakes on their tractor and rely solely on the trailer brakes for braking action. Why would they risk their lives and safety this way? To save money. This unsafe practice is.