One-way street (ippō tsūkō)
一方通行 · ippō tsūkō
Definition
On an ippō tsūkō (one-way street) all traffic moves in a single direction, so no oncoming traffic is possible. Because of that, a vehicle may use the right-hand side of the road there — the keep-left rule does not bind you on a one-way street.
On the test
True/false example: "On a one-way street, a vehicle may drive over onto the right half of the road." — True. With no oncoming traffic, the keep-left restriction does not apply.
The law behind it
The Road Traffic Act, Article 17, sets the keep-left rule but allows using the right-hand side where it does not apply — a one-way street being the clearest case, since oncoming traffic is impossible.
Road Traffic Act, Article 17 (Traffic sections) (official source)
Related guide
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