Question Vehicles should not idle for more than: Answers Three minutes. Five minutes. 10 minutes. 15 minutes. Explanation New Jersey law requires all motorists to restrict vehicle idling to three minutes or less. Idling for more than three minutes is unnecessary and harmful to your vehicle and your health. Pass your DMV Written Test with flying colors Take me to the cheat sheet New Jersey This questions appears in the following tests: New Jersey Practice Test 8 New Jersey Practice Test 43