[tim333]

Any reason you can't make tunnels? I've spent a while in San Pedro, Spain and it's been transformed by a cut and cover tunnel that the cars now go through. Seems to work fine.

https://www.sanpedromarbella.eu/san-pedros-tunnel-a-new-life...

[olelele]

https://www.ucdavis.edu/magazine/does-widening-highways-ease...

[olelele]

https://www.sciencedirect.com/science/article/pii/S096585642...