 Interstates 85 and 40 remain joined as they continue eastward to the Triangle region, anchored by the cities of Chapel Hill, Durham and Raleigh.West of Durham near Hillsborough, the two highways split, with I-40 heading southeast through Chapel Hill, Durham and Raleigh while I-85 continues eastward through Durham, then northeastward as it exits the city.In between Greensboro and Durham, 85/40 is 8 lanes wide even through the more suburban stretches.