[pierreh]

I’ll show here an interchange that I created recently in Parnal. It replaces an old parclo interchange. I am not entirely satisfied with the result : I find that the new interchange takes too much space, and contains some not so good-looking curves.

The challenge I set to myself was to keep a 6-lane 90 degrees curve between the west and the south branches. There are no FLEX pieces for RHW-6S, so that the curves consist of 2 times a pair of 45 degree RHW-6S curves with short diagonal filler pieces to link them.

Such curves do not support placing L1 or L2 FLEX stuff over them and adjacent to them, so that those FLEX parts have to be placed away from them. Another limitation is that the FLEXRamp Type A2 is not supported for RHW-8S because of the overhang, so that only Type B2 can be used.

Anyway, this is the ‘tightest’ interchange I could implement :



It should be possible to do better and use less space, in which case I would be interested by the solution.

When all curves are implemented as FLEXFly pieces, a more compact interchange is possible. Using a version of RHW prior to the one available starting with NAM 37, I had created the following interchange in Jonolray :



With the latest RHW the interchange could use a tad less space. In any case, I have a few more old parclos to upgrade, and I’ll continue to look for better interchange designs.