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Can't build sunken highways, avenues, etc.

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Hi all,

I want to construct some sunken highways and avenues in some of my cities, but it seems I can't :(

It looks so easy: use the hole digging tools, drag the highway/avenue/road over it and then a hole appears. Instruction videos on Youtube make it seem like a piece of cake, but when I do as shown in the video, all I get are errors like "unsuitable terrein/grade to build network" :(. Any ideas, anyone? This is driving me nuts.

Just for your information: I have SC4 Deluxe Edition and the NAM installed (and a lot of other plugins).

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After you build your trench, try laying down single road tiles along it to level the ground, bulldoze them, then lay whatever you were planning. Once you start fooling with the terrain like that, you'll find you get into a lot of civil engineering. Using road tiles to create a proper grade is one of the tricks that I use rather often. Usually removes the lumps.

Also, do not lay any puzzle piece based material, e.g. pedestrian mall tiles, next to your trench. The trench should have clean terrain on both sides, because sometimes other stuff locks the surrounding terrain (one grid in all directions).

  Edited by A Nonny Moose  

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  • Original Poster
  • Thank you for your replies.

    @A Nonny Moose: The terrain I used to try building sunken highways and avenues is flat and empty. Thank you for your further advice.

    @McDuell: After trying to build a sunken highway on another flat terrain (at a higher elevation), it appears your answer was right. The first area I used was pretty low above sea level.

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    McDuell beat me to it. My first thought was "terrain is too close to sea level", because I had the same exact problem and screamed a lot until it finally clicked in my brain. Glad to see the problem has been resolved.

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