What is the meaning of this traffic sign? It is a warning, instruction or prohibitory sign, which conveys a message that is not covered by the provisions of the

1. AIt is a warning, instruction or prohibitory sign, for public transport only.
2. BIt is a square information sign.
3. CIt is a warning, instruction or prohibitory sign, which conveys a message that is not covered by the provisions of the road sign table.
4. DIt is an unofficial road sign, which conveys various optional guidances.

正解: C. It is a warning, instruction or prohibitory sign, which conveys a message that is not covered by the provisions of the road sign table.