Question Vehicles are required to be covered by liability insurance: Answers Only when used on an interstate. Only when operated by a minor. At all times. Explanation South Dakota state law requires all vehicles to be properly registered and insured at all times. Drivers must keep proof of responsibility in the vehicle. Pass your DMV Written Test with flying colors Take me to the cheat sheet South Dakota This questions appears in the following tests: South Dakota Practice Test 12 South Dakota Practice Test 20