priority road
A road where vehicles have the right-of-way at all intersections along it, as designated by traffic signs. Used in legal and driving contexts.
This road is a priority road, so you can proceed through intersections without stopping.
優先 means 'priority' in general; 優先道路 specifically refers to a road with priority at intersections.
一方通行 is a one-way street, which is a different traffic regulation from a priority road.
Compound of 優先 (priority) and 道路 (road). A straightforward modern term from traffic engineering.