Do you currently have car insurance? Insurance is mandatory to drive in California Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question A combination vehicle has: Answers One air line. Two air lines. Three air lines. Four air lines. Explanation Combination vehicles have two air lines: a service line and an emergency line. Take a FREE Practice Test Now This questions appears in the following tests: Kansas Combination , North Dakota Combination , Texas Combination , Utah Combination ,