Many people view semi trucks as obstacles that block their view, slow them down when following one, and make lane changing on interstates difficult. However, they deserve respect in the sense that a large dangerous animal would: it can cause great harm. Obviously, truck drivers aren’t out to hurt anyone, but their vehicles are enormous and can’t stop or steer as well as a car. Here are three facts that illustrate how dangerous they really are: A Fully Loaded Truck Weighs 20 Times as Much as Your Car That’s assuming.