Lane Division Before Intersection
The sign indicates lane division before an intersection.
When You See This Sign
When you see the Lane allocation before intersection sign (F21) you should select the lane corresponding to your intended direction in good time and use your indicators when changing lanes. Follow the arrows and avoid abrupt lane changes or attempting to turn from the wrong lane. The sign is often complemented by road markings and should be followed together with them.
Rules & Regulations
- Each arrow on the sign shows which maneuvers are allowed from the respective lane — follow the instruction.
- Position yourself in the correct lane in good time; do not change lanes in a way that causes danger or unnecessary obstruction to other road users.
- The sign does not change right-of-way rules or road priority — still obey yield and stop signs where they apply.
- If the sign indicates that a lane ends or that lanes are divided, you must plan lane changes in good time and adjust your speed to the traffic situation.
Tips for Drivers
- Decide your exit or turn in advance so that you can be in the correct lane well before the intersection.
- Use your indicators well before changing lanes to show your intentions to other drivers.
- Reduce speed in good time if you need to change lanes or follow an arrow pointing a different way, and avoid last-second lane changes.
- Watch for repeated signs and road markings above or on the road that confirm the same lane allocation.
Common Mistakes
- Believing that the sign gives priority at the intersection — it only shows which maneuvers are allowed from each lane.
- Changing lanes too late or making sharp lane changes near the intersection thinking it is always allowed.
- Attempting to turn from a lane that is not marked for that turn.
Test Yourself
Road Sign: Lane Division Before Intersection
What is shown by this sign?
- A Lane allocation before an intersection, so you can see which lane leads to which direction.
- B That a lane ends further ahead and that you must change lane immediately.
- C That there is a diversion route for heavy vehicles.
- D That motor vehicles are prohibited from going straight ahead.
Exam Tip
On the theory test you may be asked whether the sign gives priority or whether it is permitted to turn from another lane. Remember that the arrows show permitted maneuvers — they do not give priority by themselves, and lane changes must be made safely and in good time.
Did You Know?
The F21 sign is often used on multi-lane motorway approaches, at major junctions and before exits to reduce last-second lane changes. In many cases the same information is repeated on signs above each lane for even clearer guidance.
Frequently Asked Questions
Am I required to follow the arrows on the sign?
Yes. The arrows show which maneuvers are allowed from each lane, so you should use a lane that permits your intended action. Performing a prohibited turn from a lane can lead to a fine or penalty.
Does the sign apply if road markings say something different?
The sign often complements the road markings and the information is usually repeated. If there are clear road markings or other signs in place you should follow what actually applies where you are driving and adapt accordingly.
Can I change lanes after passing the sign?
You can change lanes if it is safe and not prohibited, but if you have already passed a point where a lane ends you may need to adjust and give way. Avoid last-second lane changes because they are dangerous and may be prohibited if they cause an obstruction.
Where is the sign usually placed?
The sign is placed before major intersections, motorway exits and multi-lane approaches where it is important to show which lanes lead to which directions. In urban areas it is often seen at larger intersections with multiple lanes per direction.
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