sentences:  In the southern part of this loop, I-670 cuts directly through the downtown while I-70 bypasses the taller buildings a few blocks north near the Missouri River.Westbound I-670 is also designated Alternate I-70.Most of the interstates in this loop are in their second mile, so all exits (no matter which interstate carries the road) are numbered 2 and suffixed with every letter of the alphabet except for I, O, and Z.