Hi Michael ..

Here is an example ...

This was done with straight line segments and then filleted with various radii. I could have done the same thing with tangential arcs.

But if I could draw the first segment and then toggle for a tangential arc the end of it would be tangential and end wherever I place the next point ... with the end point determining the radius automatically ... toggle again and that starts a straight line tangential to the arc ... another toggle at the end of the straight line and the beginning of a new arc, etc.

This would allow the freedom to create almost any not predetermined arc just the same way that the arc tangential to two lines allows a variety of radii without having to pre decide the radius as in the fillet command.

I hope I am making myself clear. The object is to create a path or road center line that wanders gracefully through a land form. Existing methods work just fine but require more work than a simple toggle approach. (I don't mean that the toggle method is simple to create).

cheers,
eric