[Too]

Something interesting is that roads don’t have the same properties if you just drive them the other direction.

It’s not something you will immediately notice by just looking at the road, you have to think of the full picture.

Imagine a fork vs a merge. You have buffer zones for off-ramps. Tight merges. Psychology of drivers. Reaction to signage. All this alters the flow of traffic and create undesired bottlenecks.

In the bigger cities you can still find a few examples of such originally left roads around, with less ideal flow. Usually around tunnels where rework is difficult.