Warning for Slow-Moving Vehicles
The sign indicates a location where slow-moving vehicles frequently cross or enter the road.
When You See This Sign
When you see the sign you should immediately reduce speed and increase your attention. Expect slow-moving vehicles that may cross the road or turn in, and be prepared to stop or delay overtaking until it is completely safe.
Rules & Regulations
- The sign warns of places where slow-moving vehicles frequently cross or enter the road; it means you should be attentive and prepared for encountering them or having to brake.
- The warning sign does not change right-of-way rules or grant priority; specific right-of-way rules are shown by separate signs or road markings.
- When approaching the sign you should adjust your speed and, if necessary, stop so that passage can take place safely without endangering oncoming or crossing road users.
- Overtaking slow-moving vehicles should only be done when it is clearly safe and permitted, with clear visibility and without risking oncoming traffic or other road users.
Tips for Drivers
- Reduce speed in good time and watch for tractors, forestry machines, horse-drawn carts or other slow-moving vehicles that may cross the road.
- Keep a greater safety distance from vehicles that may stop or turn in from the roadside, driveways, or farm entrances.
- Delay overtaking until you have clear visibility and enough space; signal well in advance and check the oncoming lane carefully.
- Be especially attentive during harvest season and near farms, forest roads, or junctions where these vehicles often occur.
Common Mistakes
- Thinking that the sign gives priority or right of way — it is only a warning.
- Assuming the sign only warns of tractors and ignoring other slow-moving vehicles such as forestry machines or horse-drawn vehicles.
- Performing risky overtakes immediately when the sign is seen instead of waiting for a safe opportunity to overtake.
Test Yourself
Road Sign: Warning for Slow-Moving Vehicles
What is expected of you as a driver here?
- A Be alert for slow-moving vehicles that often cross or enter the road and adjust your speed.
- B Slow-moving vehicles are prohibited from driving here.
- C Signs indicate that cyclists have a separate lane here.
- D You must stop and give way to all vehicles.
Exam Tip
On the theory test you may get a tricky question claiming that the sign imposes a duty to give way — the correct answer is that it only warns and does not change right-of-way rules.
Did You Know?
The A31 sign is often used in rural areas and during harvest periods in Sweden to alert drivers to an increased occurrence of slow-moving vehicles.
Frequently Asked Questions
Does the warning only apply to tractors?
No, the sign applies to all kinds of slow-moving vehicles that frequently cross or enter the road, for example tractors, forestry machines, work vehicles and horse-drawn vehicles. It is a general warning for low-speed vehicles, not a sign for a specific vehicle type.
Should I always stop when I see the sign?
No, you do not always need to stop just because you see the sign. However, you should reduce speed and be prepared to stop if a slow-moving vehicle is actually on or about to enter the road.
At what distance is the warning sign placed before the location?
There is no fixed meter distance that applies in all situations; the sign is normally placed in good time before the location where the hazard usually occurs so drivers have time to react. The distance can vary depending on road type, speed level and local conditions.
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