Refers to a road or lane where vehicles can only travel in one direction. Often used in traffic signs and regulations.
This road is one-way.
Please don't miss the one-way sign.
一方通行 is the more common term for one-way traffic. 片側通行 is less frequent and may be used in specific contexts like construction zones or temporary traffic control.
Compound of 片側 (one side) and 通行 (traffic, passage).