This info is from David Layton, DOT Project manager.
There are no daytime lane closures on the Stoughton Rd on-ramp to the WB Beltline. The ramp has always merged down to a single lane prior to joining the Beltline. Our project temporarily relocated the merge point in June a few hundred yards further up. This was done to provide better visibility of the merge point during construction and prevent drivers from thinking 2 lanes continued, ending up side by side in an unsafe condition fighting for space.
What appears to be a closed lane is really just a minor change in where the ramp has always narrowed from two lane to one.