You are approaching a roundabout. A large truck is in the lane to your left and is signaling to enter the roundabout. What potential hazard should you be most aware of?

1. The truck will accelerate quickly and cut you off.
2. The truck may need more space and swing wide, potentially encroaching on your lane.
3. Debris may fall from the truck as it turns.
4. The truck's brake lights might not be working correctly.