US 421: NC16>-NC16_N
US 421 BUS (Wilkesboro): At minimum, I recommend the following:
1. Add a point at Speedway Rd for access to North Wilkesboro Speedway. (also affects NC 115)
2. Make the shaping point north of NC18/268_S visible and label it DSt_E or 6thSt_N.
3. Add a point at CBD Loop for where NC 18 SB/NC 268 WB leaves US 421 BUS NB.
NC 16:
1. US421_E>-US421(286A)
2. NC268>-US421(286B)
3. US421BusWil>-US421Bus (optional IMO)
4. US421_W>-US421_N
NC 18: I recommend moving the CBDLoop to the CBDLoop/Wilkesboro Blvd intersection where the directions split. (also affects NC 268 obviously)
NC 115: I would change US421Bus_N to NC18/268. Technically fine as-is though.
NC 163: Consider replacing shaping points with visible points.