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← Road position & overtaking
Advanced scenarios · Lesson 05

Decision workshop · Road position & overtaking

Reason from the conditions, not from a memorised answer. Read the scene, choose, then open the explanation. The drawing is illustrative; the written conditions control the question.

1. Identify the decisive details

In heavily slowed traffic, your lane ends at roadworks. Cars in the adjacent lane are already queuing. Where should you merge using the zipper rule?

Situation diagram
Situation diagramOriginal educational diagram · not to scale. Read the question for all conditions.

2. Compare the possible decisions

  1. As soon as the first advance warning sign is visible.
  2. Only after the adjacent queue has completely passed.
  3. Immediately before the narrowing, alternating with the adjacent lane.
Show the answer and explanation

Correct answer: C · Immediately before the narrowing, alternating with the adjacent lane.

The zipper rule applies here because traffic is heavily slowed and a lane ends. Alternation takes place just before the narrowing, not at the advance warning sign. It is not a requirement to wait for the whole neighbouring queue.

3. What changes if the situation changes?

With normally flowing traffic, do not assume the slow-traffic zipper obligation applies. An ordinary lane change requires giving way.

Regulatory source ↗12bisReviewed 2026-11-06

Practice questions →Apply the lesson