What is the meaning of the following traffic sign?

- Correct answer: Proceed carefully (hand held sign).
- Drive fast.
- Drive without stopping. Stopping is prohibited.
- Stop and wait for the instructions of the traffic flagger.
Why this is the answer
The correct answer in the official bank: Proceed carefully (hand held sign).
This is a hand-held sign. The word "Go" on its green side permits you to continue driving. The instruction is to proceed carefully, so it is not an instruction to drive fast. Stopping and waiting for the flagger's instructions is also not the instruction of a sign that permits you to proceed.