According to the RMTD web site the "Big Loop North and South: The Big Loop route is a bi-directional route which sweeps the Rockford Mass Transit District (RMTD) service area. As one bus leaves the downtown Transfer Center to head North (Big Loop North), another bus heads out South to travel the same route, only in the opposite direction. The Big Loop routes provide the backbone to our system. All other routes connect at some point along the way to the Big Loops, making transferring to a connecting route easier and more efficient."
