At the I-380 interchange, I-80 becomes a six-lane freeway. The Coral Ridge Avenue exit provides access to US 6, which passes beneath the Interstate just before the interchange, and the eponymous shopping center located to the southeast. The First Avenue exit in Coralville and Dubuque Street exit in Iowa City direct University of Iowa traffic to different parts of the university campus. The Iowa River flows between the two interchanges and also marks the boundary between Coralville and Iowa City. On Iowa City's east side are the Iowa 1 and Herbert Hoover Highway exits. Between them, the highway drops back to four lanes and the speed limit increases to .