Hi emersonveenstra.. 
I just saw your comment. I was off-line a couple days. It appears you or someone else changed my edit back. I would have cooperated making the change back myself if I had seen it in time.

I see your point that mapping should be close to physical separation. My logic for moving the exit junction further back was because of the Solid White Line separating the Exit lane from the South Bound lanes. A Dotted White line proceeds a Solid White Line. The Dotted white line signifies a Solid White Line for an exit is approaching. And during the Dotted White Line stretch drivers are encouraged to decide their lane if they choose to Exit or not to Exit. When the Solid White Line appears, though technically possible to move Left over the Solid White Lane, it is also "discouraged" from doing that.  Likewise it is not legal to enter an exit lane bound by a solid white lane just to pass vehicles proceeding on the highway and cross left over the Solid White Line again. As for moving Right across a Solid White Line to enter the Exit Lane and remain there, that is allowed if not cutting someone off already in the Exit Lane.  

It is encouraged to be in the Exit Lane during the Dotted Line phase or as the early Solid White Line begins. That usually coincides where the Green Hwy Exit Signage directs drivers to be in the proper lane to take the Exit.

I defer to your experience as I am relatively new on OSM. However, many navigation devices rely on OSM for their base map trip plotting. It simply is frustrating when OSM based GPS App's say: "Take the Exit" just as the physical separation occurs.. and it is physically impossible to take that exit. 

A Solid White Line signifies a lane once in. to be "discouraged" from crossing. Though not physically impossible to cross but "discouraged" from doing that.

I see your point about Physical Separation. However from a Navigational accurate standpoint.. Directing a driver to the Solid White Line Exit Lane when the Solid White Line first appears is more Functionally accurate and safer from a Navigational standpoint.

Physical Separation vs Navigational Accuracy directing drivers into their Exit Lane with enough advanced notice I'm sure would make for a good discussion.  

For now I guess I'll return to just adding or editing posted speed limits. That is something I have become more familiar with over time.

Thanks again on your comment re: my exit junction edit. With every comment I learn a little more. 