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DoubleTee Intersection v2

I didn't change much, just reduced the tunnels from 12m below ground to 9m, and updated the thumb. It's slightly smaller, 23 by 23 blocks.

This is two T intersections, as in there's access to and from all points except through east/west as shown in the picture. This can handle as much traffic as you feel like putting into it. You can use it to intersect 6 lane roads, even highways at least to a certain point. There's no traffic lights, no opposing traffic, no weaving. These kind of high-volume intersections are a much better option than roundabouts as far as I've found.

Dimensions 23x23 blocks
Heights: -9m
Construction Cost $17,896
Upkeep: $177/week

I also made a full diamond intersection, here. Which is slightly larger and allows through traffic in both directions:
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=455402506