I was in St. Louis last week and went to clinch this business loop while in the area in the westbound direction, but I noticed shields for the business loop were missing from BGSs on I-70 westbound for the Fifth St. exit including the exit ramp.
This may be the BL referenced in the
AASHTO 2022 Spring Meeting.
The one surface-level route marker going westbound that I could find in
street view where it turns left at the university was no longer there.
Streetview shows the BL shields removed from BGSs on I-70 Eastbound at
First Capitol Dr. and
Fifth St. exits.
BL Shields were still present on I-70 Westbound APL BGSs for the First Capitol Dr. exit when I went by; this was the only remaining reference I saw.