Brownsville is served by Interstate 69E, sharing its alignment with U.S. Route 77. The highway connects to the cities of Kingsville and Corpus Christi. U.S. Route 77 was a proposed part of the North American Free Trade Agreement's completed Interstate 69 corridor. Other highways that serve the Brownsville area are U.S. Route 83, U.S. Route 281, SH 4 and SH 48. Interstate 169/SH 550 is a toll road that connects North Brownsville to the Port of Brownsville; it forms a loop around the outer city limits of Brownsville. An interchange in nearby Olmito carries traffic from Interstate 69E onto the highway.