Final answer:
A 'no trucks' sign indicates that trucks are prohibited from entering or using a specific area or road for safety reasons.
Step-by-step explanation:
A 'no trucks' sign indicates that trucks are prohibited from entering or using a specific area or road. This sign is typically used to prevent heavy vehicles from accessing certain streets or areas that are not designed to handle their weight or size. It helps ensure the safety of pedestrians, other vehicles, and infrastructure by reducing the risk of accidents, damage, and congestion caused by trucks.