The most important rule in lane usage is maintain a safe following distance. If you are driving a commercial vehicle, always maintain at least 7 seconds of following distance. Scan ahead of what is immediately in front of you. If you see trouble ahead, flash your brake lights to alert drivers following you. If you cannot see ahead of the vehicle you are following, increase your following distance. You may think blind spots on large vehicles are well known. However, automobile drivers may not know you cannot see them as they pass you. Scan thoroughly before steering into the next lane. Give right of way, don't take it. Clean mirrors and check adjustment frequently.