^Eastbound trailblazer at Illinois 78 in Virginia, Illinois, January 2021.
Illinois Route 125 connects Springfield to points west, ending at Beardstown. It's the main east-west route through Cass County and northwestern Sangamon County.
Illinois 125's eastern inception comes as Illinois 97 turns northerly after making its way westward out of Springfield:
Illinois 125 proceeds west through Pleasant Plains and reaches the southern end of Illinois 123: