Swiss ‘Zipper Merge’ Rule Clarified: Late Lane Changes Are Legal, July 24

Zurich police have reignited debate over a Swiss traffic rule that most drivers still get wrong. In a video posted to Instagram this week, officers clarified that drivers who remain in their lane until the very end of a road narrowing, then merge at the last moment, are following the law correctly. The zipper merge principle, formally part of Swiss traffic law since January 1, 2021, is designed to reduce congestion by using both lanes fully.

Why the video went viral

The Zurich cantonal police video has struck a chord with Swiss motorists. Since posting, it has received nearly 30,000 likes and more than 16,000 shares on Instagram, with roughly 1,200 comments, most supportive. Many drivers commented that they have been honked at or criticized for following this exact rule. One commenter wrote: “I have been doing this for years and feel like a criminal.”

What the law actually says

The zipper merge principle is written into Article 8 of the Ordonnance sur les Règles de la Circulation Routière (OCR), which took effect on January 1, 2021. According to the Swiss Federal Roads Office (OFROU), the rule applies at every lane closure, whether from road work, accidents, or lane removal. It also applies during slow traffic at motorway entry ramps.

Why early merging causes jams

Changing lanes too early, often seen as courteous, actually wastes road space and disrupts traffic flow. The police officer in the video explained that using both lanes until the merge point optimizes capacity and reduces the risk of unnecessary bottlenecks. By contrast, premature lane changes compress traffic into a single lane sooner than needed, slowing everyone down.

A rule that has been misunderstood for five years

Despite being law for more than five years, the zipper merge remains poorly known among Swiss drivers. The viral video suggests many motorists still view late merging as rude rather than correct. The Zurich police intervention underscores how public education on traffic rules can lag years behind legal changes, leaving drivers uncertain about what is actually permitted.

Final Thoughts

The zipper merge is legal in Switzerland and reduces traffic jams. Drivers who stay in their lane until the end are following the law, not breaking it. The Zurich police video shows that five years after the rule became law, many Swiss motorists still need the reminder.

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