... transition curve instead, but in this case that wouldn't work. The reason is that in this example the 1st and 2nd radii would be concentric -- a condition which produces an infinitely long transition zone.) Instead of slewing one track by the full amount, you can split the required amount of slew between both tracks, either equally or in any desired proportion. This usually results in smoother curves. Here I have slewed the purple and yellow templates by 8mm each, increasing the space between them by 16mm in total: slewed_approach_both_long.png The full notes about using the slewing functions are at: http://www.templot.com/martweb/gs_geometry.htm#slewing regards, Martin. posted: 1 Sep 2007 16:30 from: Tim Morrow Thanks Martin Parts of Templot Club may not function unless you enable JavaScript (also called Active Scripting) in your browser. Templot Club> Forums> Templot talk> Track Clearances- slewing about Templot Club Templot Companion- User Guide- A-Z Index Templot Explained for beginners Please click: important information for new members and ...