I think the relative success of running a road to another Bluff level depends a lot on where you put the road/ramp to and from the next level. There is nothing in the spec that says that you couldn’t run a road through the middle of the module, so I’ve always thought I would eventually try and put together a switchback style road on a single Bluff Edge module that connected with the upper or lower roads between studs 4-6/8 on either side. A larger than single module might still be necessary to pull it of nicely though. If you’ve ever seen pictures of little village streets on the top of mountain ridges in Italy, that’s the style I had been thinking of.

I have also always thought of the existing roads on the modules as consisting of 1 driving and 1 parking lane. Two lane roads with no parking do exist in the real world and would look fine in this kind of context.

The tunnel idea is a good one and could make for a really nice module. There are similar concepts that would work using a tunnel under a ridge/berm/bridge coming down from the upper level though it would also require a full block module to pull off nicely.

One concept for two-lane access to a higher level I came up with was a tunnel; have a ramp leading up into the bluff and a standard base module with a tunnel leading down. It still uses two bases, but it isn’t as visually obtrusive as a massive onramp would be. Another idea involves a twin elevator system. It wouldn’t really fit in too well with a micropolis in a modern setting, but it would fit on a single module.

Of course, depending on the setting of your micropolis, if it’s based in the future, you could assume cars can drive up near-vertical surfaces (magnetized roads, maybe?) or even fly, making an onramp unneccessary.

A couple of us have looked into doing that a little bit but haven’t made any real progress. Besides, I’m all for allowing people to come up with their own solutions to the problems in the modules themselves.