Road Junction with Acceleration Lane
The sign indicates a road junction with an acceleration lane
When You See This Sign
When you see the sign it means a road joins and that joining vehicles have an acceleration lane to increase speed before merging. As a driver in the acceleration lane you should accelerate to match the main flow's speed and yield when necessary; as a driver on the main road you should be attentive and adjust your speed if needed for a safe merge.
Rules & Regulations
- The sign indicates that a road joins with an acceleration lane — vehicles entering the main road via the acceleration lane must adjust their speed and yield to traffic on the main road according to the yield rules.
- Vehicles using the acceleration lane should not stop or reverse in the lane but use it to increase speed and smoothly merge with the main flow.
- Drivers on the main road normally have priority; however, they must be attentive to merging vehicles and, if necessary, adjust their speed for a safe merge.
- Signal well in advance when merging and check your mirrors and blind spot before changing lanes or allowing a vehicle from the acceleration lane to merge in.
Tips for Drivers
- As a driver in the acceleration lane: use the full length of the lane to reach the same speed as the main flow before merging, which makes the merge safer.
- As a driver on the main road: watch the junction and be prepared to gently reduce speed if needed to let a vehicle in, rather than braking hard.
- Signal in good time both when using the acceleration lane and when changing lanes to let other traffic in — clear communication reduces misunderstandings.
- Avoid stopping in the acceleration lane to wait for a gap; if you cannot merge safely, continue to the next exit or turning point if possible.
Common Mistakes
- Believing that the sign gives the vehicle in the acceleration lane priority over traffic on the main road.
- Stopping or slowing down sharply in the acceleration lane instead of using the lane to increase speed and smoothly merge with traffic.
- Mistaking the acceleration lane for a lane that must be entered immediately without checking the main flow's speed and gaps.
Test Yourself
Road Sign: Road Junction with Acceleration Lane
What rule applies at this sign?
- A The road junction has an acceleration lane so entering and exiting traffic can accelerate before merging.
- B It is a deceleration lane for vehicles that are about to turn off.
- C The signs indicate that vehicles must stop before entering.
- D It marks the start of a lane for public transport.
Exam Tip
On the theory test a question may try to mislead by claiming that vehicles in the acceleration lane have priority — the correct answer is that the sign does not grant priority; common tasks concern who must yield and how to use the lane.
Did You Know?
F19 is a location sign often placed near motorway and high-speed road junctions to warn that slower vehicles will try to merge at higher speeds. The sign does not change who has priority; it only indicates a geometric lane for merging.
Frequently Asked Questions
Does the 'Road junction with acceleration lane' sign give the vehicle in the lane priority?
No. The sign only shows that there is an acceleration lane for merging. Vehicles in the lane must yield to traffic on the main road according to the normal yield rules unless otherwise indicated.
Should I use the whole acceleration lane before merging onto the main road?
Yes, you should use the lane's length to reach a speed that matches the main flow and thus be able to merge safely. If you cannot merge safely you should not stop in the lane but continue to a safer place to turn or proceed.
Is it allowed to stop in the acceleration lane?
Generally you should not stop in the acceleration lane because it is intended to increase speed and merge onto the main road. Stopping can be dangerous and obstruct following vehicles; only in emergencies is stopping acceptable.
Where is the sign placed and how far before the junction does it appear?
The sign is placed on the main road near the location where a road joins with an acceleration lane and warns of the upcoming merge. The distance to the actual junction can vary depending on road type and local conditions, but the purpose is always to provide good advance warning.
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