Final answer:
Garbage trucks have a sign on the back indicating that they are slow-moving vehicles. When you see this sign, you should be cautious and give the truck plenty of space.
Step-by-step explanation:
Garbage trucks have a sign on the back indicating that they are slow-moving vehicles. This sign is usually an orange diamond-shaped placard with the letters 'SMV' (Slow Moving Vehicle). When you see this sign, you should be cautious and give the truck plenty of space. Slow down and maintain a safe distance, as the truck may make frequent stops and have limited visibility.