This yellow sign means: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question This yellow sign means: Answers There is a sharp turn to the right. The lane must turn right. A right turn is permitted on a green arrow only. Explanation Some warning signs have a fluorescent yellow-green background. These signs warn of upcoming conditions, including roads with curves and sharp turns.