Shuttle-UM drivers do not have to transport unmasked passengers if it makes them uncomfortable.
The additional bus follows cuts to the route, which left students stranded at the West Diamond Ave Park and Ride lot early this week.
Service on the #141 Shuttle-UM bus is one-third of what it was in fall 2020.
The College Park Metro station is among four Green Line stops set to reopen next week.
More than 50 people gathered to protest for better maintenance of buses and hazard pay for DOTS employees.
Some routes have new frequencies, times in the fall semester.
The Greenbelt, Prince George’s Plaza and West Hyattsville stations will also be closed through Sept. 6.
The driver was told Thursday he'd be disciplined for his actions.