What are you required to do according to the following road sign?

- Honk continuously to warn the tractor drivers.
- Give right-of-way to an agricultural vehicle on a freeway.
- Turn-on the lights and stay on the right of the road.
- Correct answer: Slow down as you may encounter a heavy and slow agricultural vehicle.
Why this is the answer
The correct answer in the official bank: Slow down as you may encounter a heavy and slow agricultural vehicle.
This is a warning sign for agricultural vehicles, such as tractors. These vehicles are heavy and slow, so you should slow down and be ready to encounter them. A warning sign does not give right of way, and it contains no instruction to honk.