If you have driven in Germany and felt a surge of frustration as a car sped past you in a closing lane only to cut in right at the end, you are not alone — and you may have been reacting to something that is not just acceptable in Germany, but legally required. The Reißverschlussverfahren, literally 'zipper procedure', is a traffic rule enshrined in German road law that governs how drivers must behave when a lane narrows or ends. For expats who learned to drive in another country, understanding this rule can be the difference between road rage and calm, legal driving. This guide explains what the rule says, why it exists, and how to apply it correctly.
The word breaks down neatly: Reißverschluss means zipper, and Verfahren means procedure or process. Together, they describe exactly what should happen when a traffic lane ends: vehicles in both the continuing lane and the closing lane should keep moving until the very point where the lane ends, then merge alternately — one from each lane, like the teeth of a zipper closing.
The rule is codified in §7 of the German Straßenverkehrsordnung (StVO), the national road traffic regulations. It applies in situations where a lane is marked as ending — for example, during roadworks, at a motorway on-ramp, or where two lanes become one.
This is the part that surprises many drivers from other countries. In many driving cultures, the polite and expected thing to do when a lane is ending is to merge early — to move over as soon as you see the warning sign, and not to 'jump the queue'. In Germany, this approach actually works against the intended function of the rule.
The Reißverschlussverfahren is designed to keep traffic flowing as efficiently as possible. If everyone merges early at the first sign of a narrowing road, one lane becomes empty while the other backs up — creating a longer, slower queue than necessary. By using both lanes fully until the merge point and then alternating, traffic moves more smoothly overall. Research in traffic engineering consistently supports this: the late zipper merge reduces queue length and improves throughput.
So the driver speeding past you in the closing lane is not being rude — they are following the law and the most efficient approach. Drivers in the continuing lane are also legally required to allow merging vehicles in, one at a time.
Here is what the Reißverschlussverfahren means for you in practice:
Yes. It is explicitly regulated in §7(4) of the Straßenverkehrsordnung (StVO). Drivers who fail to allow a merging vehicle to enter — or who unnecessarily block the closing lane — can be fined. The rule applies on motorways and on regular roads wherever a lane is formally marked as ending.
Not always. The Reißverschlussverfahren applies specifically where a lane is ending due to road layout — not at every situation where traffic narrows. At intersections or where drivers voluntarily move between lanes, normal right-of-way rules apply. When in doubt, look for road markings indicating the end of a lane: these signal that the zipper rule is in effect.
The Reißverschlussverfahren is one of those German rules that, once you understand it, makes driving significantly less stressful. What looked like aggressive or impatient behaviour from other drivers turns out to be legally correct and traffic-efficient. As an expat driving in Germany, knowing this rule helps you drive legally, avoid unnecessary frustration, and adapt to local road culture. If you are in the process of converting a foreign driving licence to a German one, or if you are studying for the German driving theory test, this is a term and concept that will almost certainly appear.
Source: The Local Germany
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