If this is what you mean (click here), I'd call it a "single carriageway".
Student or Learner
How does one describe a roadway consisting of one lane running in each direction?
If a bridge were involved, I would say "The bridge has one lane running in each direction" since I am uncertain as to the image you get from "The bridge has a two-lane highway." Would the latter not give the impression that the bridge consists of a highway with 2 lanes running each way?
It's probably so obvious - I've just been giving this one too much thought.
Thank you, MrPedantic.
You wouldn't by chance know the North American term for the same? If it would be a one-lane or two-lane highway (depending on whether the lanes running in a single direction are calculated or the total number of lanes shoulder-to-shoulder?)