Safety Sign: No Heavy Vehicle Entry This sign warns that driving a heavy-duty vehicle past its posted location is forbidden. Usually, its purpose is to keep big trucks, buses, and other heavy vehicles out of places where they could endanger people's safety or cause harm. It is important to post the "No Entry for Heavy Vehicles" sign in prominent places so that approaching cars may see it. Because truck drivers have a higher vantage point than automobile drivers, this is particularly crucial. This sign is frequently used to control traffic and guarantee safety on highways and in designated locations throughout a number of nations.