Hawaii · Handbook chapter 2 · 3 min read
Chapter 2: Vehicle equipment, inspection and registration
Hawaii's required and illegal equipment, the yearly safety inspection, tire, brake and steering checks, seat belt law, registration, license plates and out-of-state vehicles.
Why this chapter matters
You are responsible for the condition of any vehicle you drive, even one you do not own. The test can ask about inspections, tire tread, steering play and plates. Key figures: once a year, 1/16 inch, two inches, 12 months and 30 days.
Required and illegal equipment
Every vehicle must have working brakes, steering, horn, lights, glass, wipers, tires, exhaust, speedometer, bumpers and other basic parts. These are prohibited on private vehicles:
- A red light showing to the front or a blue light visible outside, except on authorized emergency vehicles.
- A bell, exhaust whistle or siren, except on emergency vehicles.
- A muffler cut-out or bypass, or a muffler louder than the original equipment.
The safety inspection
- Vehicles on public roads need a Periodic Motor Vehicle Inspection at least once a year.
- Ambulances are inspected every six months.
- New vehicles need no further inspection until two years after they are first sold.
- You must show a Hawaii insurance identification card to pass. The inspection certificate stays in the vehicle.
Checking your vehicle
| Part | What to know |
|---|---|
| Brakes | Test by braking fairly hard at 4 to 8 mph; the car should not pull to either side |
| Tires | Check at least monthly; replace below 1/16 inch of tread (if a penny upside down shows the whole top of the head on the coin, replace the tire) |
| Steering | No more than two inches of free play with power steering (engine running), three inches without |
| Exhaust | Leaks can cause carbon monoxide poisoning |
| Hood | A primary latch and a secondary catch keep it from flying up |
| Signals | If they fail, use hand signals until repaired |
Seat belts and child restraints
The 2023 manual says all front and back seat occupants must use seat belts. Children under 4 must be in a child restraint, and the manual says children under 8 may need a booster seat depending on their size. Air bags only supplement belts, because they deflate right after the first impact.
Registration
- Register your vehicle in the county where you operate it, and renew every year. You need a current safety inspection certificate first.
- Registrations expire at the end of the twelfth month and can be renewed by mail or online.
- Report a change of address to the county agency in writing within 30 days. For a change of name, appear in person within 30 days.
- A vehicle registered in another state can get a temporary permit to use Hawaii roads for no more than 12 months.
License plates
Motorcycles, trailers and semitrailers show a plate on the rear only. All other vehicles need plates on the front and rear. Mopeds display their plate or decal on the rear.
Frequently asked questions
How often does a car need a safety inspection in Hawaii?
At least once a year, with an exception for new vehicles until two years after they are first sold.
What tread depth means a tire must be replaced?
Less than 1/16 inch.
Do back-seat passengers have to wear seat belts?
Yes. The 2023 manual covers all front and back seat occupants.
Which vehicles need only a rear plate?
Motorcycles, trailers and semitrailers.
Based on the Hawaii Driver's Manual (2023 edition), Chapter II: Vehicle Equipment and Inspection and Chapter III: Vehicle Registration.