A diamond-shaped 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 A diamond-shaped sign means: Answers Yield. Stop. Warning. Explanation Diamond-shaped signs are used to warn drivers of special conditions or hazards ahead. They are typically yellow or orange in color. This questions appears in the following tests: Wisconsin Motorcycle Practice Test 14