If you are behind a truck and you can't see the truck's mirrors, then you're too close. The truck driver can't see you. Always wear a safety belt. Get a map and plan your route before driving. Use alternate routes to avoid traffic congestion.
Signal turns before changing lanes.
Turn on your headlights in low light or inclement weather to help those around you see your vehicle. Do not tailgate or rubberneck. Avoid stopping on highways, especially if you miss your exit.