Hi Martin,
I tried to copy this box file and then use a simple link as you suggested, but with zero success.
so I tried the attached idea which uses two transition curves. Clearly not 100% sure what Penrhos 1920 was trying archive, so I have just made the two roads parallel.
what I tried to do was to use a hand positioned transition S curve, in the end I found I needed two translon S curves.
hence my question. Am I on the right lines with this approach?
cheers
Phil,