Dangerous Overhead Line
The sign indicates that there is an electrical line above the road that may pose a danger.
When You See This Sign
When you see the sign you should immediately check that your vehicle's and load's height is safe in relation to the line and lower any movable parts. Only pass if you are certain there is no risk of contact; avoid stopping or parking under the line.
Rules & Regulations
- The sign indicates that a high-voltage overhead power line crosses or runs close to the roadway and that contact can be life-threatening.
- It is not a prohibition sign – you may pass, but you must ensure that your vehicle's or load's height is sufficient before driving under the line.
- Do not stop or park directly under the line if there is a risk of contact with cargo or equipment.
- If your car or load comes into contact with a line: turn off the engine, stay in or by the vehicle and call 112 immediately if the line appears to be live or if there are injuries.
Tips for Drivers
- Check the height of your load and any attachments (e.g., ladders, cranes, antennas) before passing under a marked line.
- Lower or lock movable parts (cranes, lifts, antennas) as far as possible before driving under the line.
- If you see a fallen line: keep your distance, warn other road users and call 112; do not touch the line or a vehicle in contact with it.
- If your vehicle is subjected to electric arcing, remain inside the vehicle and wait for rescue services unless there is an immediate fire risk; do not jump out of the car and touch the ground with both feet at the same time if you are forced to leave.
Common Mistakes
- Confusing the sign with signs for a low bridge or limited clearance — this sign specifically warns of an electric line over the road.
- Thinking the sign means a total stop or prohibition of passage for all vehicles; it is an informational warning that requires caution and height control.
- Underestimating the danger if the line is higher than the vehicle — even near contact can be hazardous to equipment or when weather makes the line move.
Test Yourself
Road Sign: Dangerous Overhead Line
What should you be aware of here?
- A There is a live electrical line over the road that may be life-threatening — be careful with tall loads and cranes.
- B This is a warning for low bridge clearance under the road.
- C The road surface is slippery when it rains and requires a lower speed.
- D The road section is closed to heavy traffic.
Exam Tip
In the theory test they may ask what to do if your vehicle comes into contact with an electric line. The correct answer is often to stop, not leave the vehicle unless absolutely necessary, and call 112 — avoid answer options that say you should immediately jump out and run away.
Did You Know?
Sign J3 is often used on country roads and at temporary installations in agriculture and construction sites where power lines cross the road at low height. It was introduced to more clearly alert drivers to electrical hazards that are not in the same category as a low bridge.
Frequently Asked Questions
Does the sign mean I may not drive under the line?
No, the sign provides information and does not prohibit passage, but you must check that your vehicle's and load's height is sufficient and take measures to avoid contact.
What do I do if I see a fallen power line on the road?
Keep your distance, warn other road users and call 112. Do not touch the line or a vehicle in contact with the line; wait for the rescue service.
Does the sign apply only to large vehicles like trucks and machines?
No, the sign applies to all road users because even passenger cars with roof loads or open doors and cyclists carrying long objects can risk contact. It is especially important for vehicles with high or unstable loads.
Should I lower temporary parts like antennas or cranes before passing?
Yes. Lower or lock down any movable or extendable parts that could come into contact with the line before driving under the sign.
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