My research suggests that there exists a wide variety of definitions for vision/visibility triangles throughout municipal and state governments (and even ITE and AASHTO). The differences include the distance of the triangle, whether or not the intersection is controlled and the point of origin for the triangle. It is the latter, the point of origin question, which is currently the most vexing to me. The two most common options appear to be:
1) Beginning the triangle at the intersection of right of way lines (as shown here: http://www.sturtevant-wi.gov/index.p...ge:Vision1.jpg) or;
2) Beginning the triangle at the intersection of street edges (as shown here: http://www.qcode.us/codes/roseville/..._160&frames=on)
I think you can clearly see how this little difference could have varying impacts on private property. I'm not really worried about what your local codes require but I am more interested in what you would find as preferable while still maintaining public safety. Thanks for the opinions!