A combination vehicle has ____ air line(s). 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 combination vehicle has ____ air line(s). Answers One Two Three Explanation Every combination vehicle has two air lines: the service line and the emergency line. This questions appears in the following tests: Alaska Combination Iowa Double Iowa Combination Louisiana Combination Minnesota Combination New Hampshire Double Oklahoma Combination South Carolina Combination Vermont Combination Virginia Combination