MergingJapan
Traffic rules
Japan
1. Merging
Merging is the process of joining a stream of traffic from another lane or road, such as when an entry lane joins a motorway or when two traffic lanes become one. The merging driver must observe surrounding traffic, signal when required and enter an appropriate gap safely.
Drivers already in the continuing traffic lane should remain alert to merging vehicles and avoid unnecessarily preventing them from joining. Special zipper-merging rules may apply when traffic is heavily congested and a lane ends.
Who has priority at Japanese motorway entry merges?
Traffic already on the main carriageway. Entering vehicles must not obstruct it.
🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 26-2 and 75-6 to 75-7
🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text
Does zipper courtesy guarantee entry priority in Japan?
No. Even if it seems your turn, you cannot force an unsafe merge.
🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 26-2 and 75-6 to 75-7
🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text
What controls priority where Japanese main carriageways combine?
Follow the markings identifying the priority main carriageway.
🔗 laws.e-gov.go.jp • Japan Road Traffic Act — Articles 26-2 and 75-6 to 75-7
🔗 laws.e-gov.go.jp • e-Gov — current enforced Road Traffic Act, revision metadata and full text
