Wow, that was fast for a change. I was able to add just a few lines of code to start getting the intersection's grayscale maps going. I cheated a bit as I coded the road to be level until I can update the road averaging code (what keeps the road moving up and down with the terrain). And as the image shows, there's a "monument" in the middle of the intersection which comes from no drawing routine for that small part. And the cut and fill misses a quadrant of the intersection. And I still have to add code to the road texture subroutines. Other than that, I'm pleased I got something I could render in Bryce after 15 minutes rather than the usual multiple days of tracking down problems.
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