Just a guess, you were around the Airport area, approaching the I-85 intersection. TOOOO many ramps & Bottle-necks there! Three lanes going to two, to one lane, Especially heading I-85 S. 85 S. is already backed up there, as 85 goes from 4 lanes to 3 lanes, in Gaston county. Just Good Ol Stupid Engineering! Top that off with McAdenville [Christmas Town], just turned on their Christmas lights, last night, which Jams the next two 85 exits!
Want More, give 77 N or S a run, from 485 to Mooresville, any week day!
Second to that might be I-85 S. between Salisbury & K town!