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 Which of these vehicles must always stop before crossing railroad tracks? Answers Tank trucks marked with hazardous materials placards. Motor homes or pickup trucks towing a boat trailer. Any vehicle with three or more axles and weighing more than 4,000 pounds. Explanation Trucks transporting hazardous loads must stop before they cross railroad tracks. Take a FREE Practice Test Now This questions appears in the following tests: California Practice Test