two types, ground tunnel and wall tunnel

[Siverto]

its finally possible to go through mountians! hooray. but it does look weird when the entrance of the tunnel is sunken in the ground. It would be better if there was to types of tunnels. and that this type has rounded walls. That would be awesome!

 

[cRAGGLE]

For purely aesthetic reasons I'd have to agree. It'd be nice if the lights inside the tunnel lit up as well.

 

[Mr Maison]

This is actually what I was expecting.Not all tunnels go underground. In fact most do not I think.Only in cases where the tunnel is crossing a body of water or sinking under city infrastructure. But for all tunnels to behave like this is a bit limiting.

 

[Grockefeller]

That is actually possible if u make a tunnel near a non-flat terrain.

 

[stuwater]

You do it the same way you build bridges that stay the same height. Build in small segments and control their height individually.

 

[Simulant]

That's a bit tricky to achieve - if you start with a long tunnel segment it usually tends to dive or rise far too high. I'm curious if the new road height tool helps.
When TotalyMoo showed the first tunnel picture after all that "tunnels are awesome! they look amazing!" - hype I feared the worst after seeing the cartoonish slope in his pic...
Some of the ground level underpasses i make in the old SimCity4 way - using the slope terraform tool in game to make a sunken road and from there i try to dive in horizontally which definitely is the trickiest part....

 

[Gilga]

Definitely you can do wall tunnels, just need some patience