Thinking it might be possible to incorporate the diverging aspect of DDIs into a 4-way roundabout, I came up with this free-flow (highway-to-highway) interchange, which only requires 4 relatively small flyovers/underpasses (compared to similar structures).
(Here is a mirror image if you happen to drive on the other side.)
I couldn't find it on the wikis. Is this a thing? Since I'm not an expert, I wonder if there are use cases, what are the pros and cons and whether something like this exists in the real world?
Navigation is pretty straightforward. Here's how it works:
- To turn right, use the right lane.
- To turn left, use the left lane and merge left.
- To go strait, use the left lane and stay on that lane.
(In practice you would just have to follow the big road signs overhead, just as with any other large highway interchange.)
Notes: U-turns are also possible, using the left lane and merging to the right twice. Weaving is probably not much of an issue as merging to the right only happens in the rare cases of U-turns and sub-optimal routings.
