Warning for Roundabout
The sign warns of a roundabout.
When You See This Sign
When you see A30, slow down, check the lanes, and be prepared to yield to vehicles already in the roundabout. Choose the correct lane well in advance, watch for cyclists, and use your indicators when exiting.
Rules & Regulations
- The sign warns that a roundabout is ahead — you should reduce speed and be prepared for crossing traffic.
- Vehicles already in the roundabout normally have priority; you must yield when you join the circulation.
- Follow lane markings and supplementary road signs at the entrance, especially in multi-lane roundabouts where lane choice determines your route.
- Signal clearly when you intend to leave the roundabout (usually the right indicator) and do not force your way into circulating traffic.
Tips for Drivers
- Reduce speed in good time when you see the sign and scan traffic in all directions before you approach the entrance.
- Choose the correct lane in advance according to road markings and stay in your lane throughout the roundabout.
- Give way to vehicles in the roundabout and allow extra room for larger vehicles such as buses and trucks.
- Use your right indicator when exiting the roundabout and be especially attentive to cyclists and pedestrians at the entrances and exits.
Common Mistakes
- Assuming you have priority when approaching the roundabout.
- Forgetting to signal when exiting the roundabout.
- Choosing the wrong lane late and being forced to change lanes inside the roundabout.
Test Yourself
Road Sign: Warning for Roundabout
What does this sign mean for you as a driver?
- A Roundabout ahead — be prepared to give way to vehicles already in the roundabout.
- B It is a warning for a level crossing without barriers.
- C You must stop before entering the roundabout.
- D It is an information sign showing the start of a priority road.
Exam Tip
On the theory test you are often asked who must yield at a roundabout — remember that vehicles already circulating normally have priority unless indicated otherwise.
Did You Know?
A30 is a standardized warning sign for roundabouts, and the number of roundabouts in Sweden has increased because they generally reduce speeds and serious collisions at intersections.
Frequently Asked Questions
Does the sign mean I must stop?
No, it's a warning sign indicating a roundabout ahead. You do not always have to stop, but you should reduce speed and yield if necessary or if a yield sign is present.
Do I always have to yield to vehicles in the roundabout?
Yes, normally vehicles in the roundabout have priority. Exceptions can occur if special signs or traffic signals indicate a different order.
When should I use indicators in a roundabout?
Show the right indicator when you leave the roundabout so other road users understand which exit you will take. Be clear well in advance; in multi-lane roundabouts you can also use the left indicator to signal that you intend to pass additional exits before leaving.
Am I allowed to change lanes inside a larger roundabout?
In multi-lane roundabouts you may change lanes if it can be done safely and without disrupting other vehicles. However, it's better to choose the correct lane before entering and follow the road markings.
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