Warning for Tunnel
The sign warns of a tunnel.
When You See This Sign
When you see the tunnel sign you should immediately adjust your speed, switch on appropriate lighting and be prepared for changed visibility and traffic flow. Look for and follow any supplementary signs or electronic instructions that indicate speed, lane rules or other restrictions.
Rules & Regulations
- The sign warns of a tunnel ahead; adjust your speed and your driving as you approach.
- Turn on your vehicle's dipped headlights (or daytime running lights if your car has them) when driving in the tunnel for better visibility and conspicuity.
- Do not stop or park in the tunnel except in an emergency; follow instructions from the tunnel's signage and signal systems.
- Obey any supplementary signs indicating speed limits, overtaking bans, or maximum height — the warning sign itself does not indicate these restrictions.
Tips for Drivers
- Reduce your speed before entering so your eyes have time to adjust to the darker environment inside the tunnel.
- Turn on your lights in good time and be prepared to switch off high beam if it dazzles oncoming or preceding vehicles.
- Keep a safe distance to the vehicle in front — braking and queueing can occur suddenly in tunnels.
- Pay attention to electronic signs, audible warnings and emergency exits; local instructions in the tunnel can change the traffic situation quickly.
Common Mistakes
- Assuming the sign is merely informational and therefore not slowing down or turning on lights.
- Confusing the warning sign's meaning with a height restriction — maximum height is shown by a separate sign.
- Changing lanes at the last moment before entering the tunnel without checking for bans or narrow passages.
Test Yourself
Road Sign: Warning for Tunnel
What does this sign mean for you as a driver?
- A Tunnel ahead — pay attention to visibility, lights, and any special rules in the tunnel.
- B Underpass where pedestrians have priority — reduce speed to walking pace.
- C Bridge ahead — prepare for height restrictions.
- D Dark stretch without lighting — use high beams at all times.
Exam Tip
A common exam trick is to ask what the sign itself indicates — the correct answer is that it warns of a tunnel, but that speed limits, maximum height and overtaking bans require separate signs or supplementary plates. Remember to mention lighting and that you should stop only in an emergency.
Did You Know?
The tunnel warning sign is often used before longer road tunnels along motorways and national roads in Sweden; because tunnels affect visibility and ventilation, it is one of the most common warning signs in mountainous and coastal areas.
Frequently Asked Questions
Do I have to turn on my lights in the tunnel?
Yes, you should turn on appropriate lights (dipped headlights or daytime running lights) when driving in the tunnel to improve visibility and conspicuity. Follow local instructions if different lighting is required.
Does the sign mean overtaking is prohibited?
No, the warning sign itself does not prohibit overtaking. An overtaking ban is marked by a separate prohibition sign or road marking.
Does the sign indicate a height restriction?
No, the tunnel warning sign only shows that a tunnel is coming. Maximum height or other dimensional restrictions are shown by separate signs before or at the tunnel entrance.
Am I allowed to stop in the tunnel if the car breaks down?
Stop only in an emergency. First try to reach an emergency bay or lay-by, use hazard lights and follow the tunnel's procedures for assistance and evacuation.
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