Question How often are motor vehicles required to be inspected? Answers Once every four years Once every three years Once every two years Once every year Explanation Vehicles must be inspected once a year during the owner’s birth month. To have your vehicle inspected, you should make an appointment at an official inspection station. Pass your DMV Written Test with flying colors Take me to the cheat sheet New Hampshire This questions appears in the following tests: New Hampshire Practice Test 21 New Hampshire Practice Test 19