Extended Road Upgrade – Upgrade between one- and two-way roads!
This mod adds two new road building tools that allow you to upgrade between one- and two-way roads and to change one-way road directions, without having to demolish and rebuild the road.
The tools work very similar to the default road upgrade tool. To convert an existing one-way road to a two-way road, you simply select the two-way upgrade tool and click on the segment of the the road you want to upgrade, and drag along the road to convert multiple segments. To convert a two-way road to a one-way road, however, you must drag to the direction you want the road to go instead of just clicking. One-way roads can also be changed to go to the opposite direction in the same manner.
The roads are always converted to the same type counterparts, so it does not matter which road type you have selected in the road tool. This also means that it is not possible to directly convert a 4-lane road to a one-way road, because there is no 4-lane one-way road type in the game. Instead you must first upgrade the road to a 2- or 6-lane road and then convert it to a one-way road.
While there are not known issues with the mod, it is still somewhat experimental. Therefore it is recommended that you always save your city before using the mod.
Full source code is available at: https://github.com/viakmaky/Skylines-ExtendedRoadUpgrade