After this phase of the project began, a significant change was made to the temporary traffic flow on northbound 515/93/95 just before the I-15 junction:
When the lane reductions began a couple of weeks ago, the left lane on north 515/93/95 ended at Casino Center, forcing traffic into a merge. But when I went through a week later, the configuration has changed so that the left lane no longer ends. Instead, lane #3 is now an exit-only lane for I-15 north (it wasn't that way before), leaving two lanes continuing past I-15 but now much more smoothly.
This seems to have made a big difference, and I don't think this was necessarily what was first planned.