... :03 from: Martin Wynne Hi Terry, It is not mathematically possible to create a transition curve if the two curves intersect. You need to adjust the radius of one or the other or both of the templates until the track centre-lines do not quite intersect, like this: 2_040956_150000000.png Sometimes it is necessary to temporarily extend the length of the templates to see this. The length of the resulting transition zone is determined by the size of the gap you leave between them. This is the result of the above: 2_040956_160000001.png It now needs to be extended to fit the previous space -- more info at: http://templot.com/companion/link_existing.php cheers, Martin. posted: 4 Aug 2019 16:17 from: Terry Schroeyens Thanks Martin, It worked (eventually). So much track extension and curving were needed to avoid intersections. Terry posted: 5 Aug 2019 11:40 from: Martin Wynne Having posted the above explanation so many times over the years, I have now added it to the error message in the ...