From my personal driving experiences, interacting safely around trucks requires extra caution and awareness. "Car tapping" might refer to the action of lightly tapping a truck, whether as a signal or an accidental touch, and it’s crucial to avoid any sudden movements that could lead to accidents. Trucks have larger blind spots compared to cars, so when driving near them, maintain a safe distance and avoid lingering alongside them for long periods. Always signal your intentions clearly and anticipate their wide turns. If by "tap the truck" someone implies the act of lightly contacting the truck, it’s generally best to refrain from this unless absolutely necessary and done safely, such as a gentle tap to gain attention while parked. In summary, understanding truck dynamics and practicing safe interaction can prevent accidents and improve road safety for everyone. Always stay alert and respectful when sharing the road with larger vehicles.