^Northbound trailblazer at Illinois 10 in Weldon, February 2018.
Illinois Route 48 runs northeast-southwest through central Illinois, slicing right through Decatur. Illinois Route 48 connects Decatur with points northeast and southwest of that city.
Illinois 48's northern end is at Illinois 54 near Bellflower:
From there, Illinois 48 heads due south to cross Illinois 10 at Weldon:
At Taylorville, Illinois 48 passes underneath Illinois 29, and the two routes are connected by an access road:
At Raymond, Illinois 127 comes from the south and joins Illinois 48 west, so the two routes can ride together westerly into the metaphorical sunset:
Illinois 48 and Illinois 127 end together at the same point, at an interchange with Interstate 55 (I'm not sure why only an Illinois 48 end marker is posted, but not an Illinois 127 end marker):