Breaking Down Near the H-3 Tunnels on Oahu: How to Get Out and Get Help

If your car starts to fail near the H-3 tunnels on Oahu, keep it rolling and get out the far side of the Harano Tunnels. Hawaii's driver manual lists a tunnel as a place you may not park. If the car dies inside, turn on your flashers and headlights, stay buckled in and call 911. The free state freeway patrol does not cover H-3, so the next call for help with the car is yours to make.

Why is a breakdown on H-3 harder than one in town?

H-3 runs from the Halawa Interchange, over long viaducts in Halawa Valley, through the Tetsuo Harano Tunnels in the Koolau Range and down a viaduct along Haiku Valley. Long parts of it are bridge or tunnel, with no side streets to duck into.

HDOT added flexible plastic poles along the edges of the travel lanes at the tunnels. They help keep drivers in line and slow them down. They also mean there's no wide strip to pull onto at the tunnel mouths.

Hawaii's driver manual says parking is not allowed on a bridge, a raised structure or in a tunnel. On H-3, that covers a lot of the road. So your goal is simple: don't stop by choice until you're on solid ground with room to spare.

What should you do if the car starts to fail before the tunnels?

You often get a warning. The temperature needle climbs on the long grade. A dash light comes on. The engine stumbles. Decide now, while you still have power.

• Heading to Kaneohe: if you're still near Halawa, the Halawa Interchange is your last easy way off before the climb.
• Heading to Honolulu: the Kaneohe and Halekou interchanges come before the tunnels. Leave there if the car feels wrong.
• Already on the grade: keep a steady speed in the right lane with your flashers on. Aim to clear the tunnels and the viaduct before you stop.
• Overheating: turn off the air conditioning to ease the load. If the needle hits red, stop at the first safe spot past the tunnel.

HDOT's posted limit approaching the tunnels from Kaneohe has been 45 mph, and 55 mph inside. Follow the signs you see. Slow is fine. Stopping in the lane is not.

What if your car dies inside the Harano Tunnels?

This is the moment people fear most. Stay calm and work through it in order.

1. Coast as far right as the lane allows. If the car still rolls, let it carry you toward the exit.
2. Flashers on. Headlights on, so drivers behind you see you sooner. The state's manual calls headlights critical in tunnels.
3. Seat belt stays on. Doors stay locked.
4. Call 911. Tell them you're stopped inside the H-3 tunnels, which direction you were going and which lane you're in.
5. Stay in the car. The manual says not to walk on freeways, and a tunnel gives you no room to walk.

The one exception is fire or smoke. The manual says to get everyone out and well clear of the road, because fumes can fill a car fast. If you see smoke or smell burning, get out on the side away from traffic and move toward the nearest exit, away from the smoke.

What about the viaducts on either side?

A stall on the Halawa or Haiku Valley viaduct follows the same rules. There's no ground to step onto beside the rail. Stay buckled in with your flashers on and call 911 first. Wait for police or road crews before anyone works on the car.

Where can you stop once you're out of the tunnel?

Keep going until the road gives you real room. On the Kaneohe side, that usually means taking the Kaneohe, Halekou or Mokapu interchange and getting onto a surface street. On the Honolulu side, the Halawa Interchange leads off the freeway toward Moanalua and Aiea.

A parking lot or a wide side street beats any freeway shoulder. There, a jump start or a tire change can happen without traffic beside you.

Watch for one closure. HDOT closed the on-ramp from Pali-bound Kamehameha Highway to westbound H-3 at the Halekou Interchange after Kona Lows and heavy rain in March and April 2026 broke a culvert under the road. The ramp was still on HDOT's closure list for the week of Sept. 26 to Oct. 2. The state's detour is a U-turn at the Halekou Interchange, or Likelike Highway instead. HDOT puts full repairs at November 2026, weather permitting.

Who helps on H-3 when you break down?

The state's free Freeway Service Patrol works parts of the H-1, the H-201 and a short piece of the H-2. H-3 is not on its list. HDOT says to call 911 if you're outside its area or it's after hours.

Police handle the danger: traffic, lanes and anyone hurt. Moving your car is up to you. If it won't start once you're clear, you need a car tow to your home or a shop. If you slid onto soft ground at a ramp or a turnout, a winch-out can pull it back onto the pavement, as long as it's close to the road.

Be careful with strangers who stop to help on a dark stretch. The state's manual says to stay locked in until you're sure of a person's intentions, and to ask for police if in doubt.

Is H-3 closed when you need it most?

Sometimes. HDOT closes lanes near the tunnels for upkeep. In late September 2026, its list showed a right lane closed eastbound between the Harano Tunnels and the Hospital Rock Tunnels for weld repairs. Honolulu-bound had a right lane closed between the Hospital Rock Tunnels and the Harano Tunnel's Halawa portal for tunnel work.

HDOT has also shut a full direction of H-3 at the tunnels overnight, 7 p.m. to 7 a.m., for maintenance. In July 2024 it closed Kaneohe-bound H-3 overnight to fix a bridge joint just past the tunnel. When that happens, the state sends drivers over Likelike Highway through the Wilson Tunnels or the Pali Highway through the Pali Tunnels. Message boards warn you before the closure.

A lane closure means one less way around a stalled car. Before a late drive over the Koolau, check HDOT's Oahu lane closures. GoAkamai shows travel times and camera views for H-3 and the other Koolau routes.

How do you tell your driver where you are on H-3?

Your phone's pin can be off near tall valley walls and in tunnels. Give clear words too:

• Your direction: Kaneohe-bound or Honolulu-bound.
• Your side of the tunnels: Halawa side or Kaneohe side.
• The last interchange you passed: Halawa, Kaneohe, Halekou or Mokapu.
• Where you stopped: the ramp, the street or the lot name.

Hawaii's move-over law, HRS 291C-27, tells drivers to slow down and change lanes when it's safe for a stopped tow truck with flashing lights. On a two-lane stretch, that space is thin. One more reason to meet your driver off the freeway.

How does Sentinel Towing work on Oahu?

Sentinel Towing is a towing and roadside network, not a tow company. A vetted local partner tow company on Oahu does the job. We text you a locked price before anyone drives out. Then we stay with you by text until help arrives. That is our Stay-With-You Promise. Tows stay on Oahu. For more on the island, see our page on towing in Honolulu.

Stuck right now? Call 1-888-TOW-1213, or request help online.

H-3 Tunnel Breakdown Questions

Rules change, so check the official source before you rely on it. Sources: Hawaii Drivers Manual, HDOT Harano Tunnels safety update, HDOT Oahu lane closures, HDOT Halekou ramp closure, HDOT H-3 tunnel closure, HDOT H-3 joint repair, HDOT FSP service area, HRS 291C-27, GoAkamai.