Highway. Interstate279 heads southeast from Interstate 79 in Pittsburgh's northern suburbs to Interstate 376 in downtown Pittsburgh. Interstate 579 heads
Primary Interstate Highways are the major interstate highways of the United States and have a one or two-digit route number. Even (0, 2, 4, 6, or 8) route
Interstate 285 (I-285) is an auxiliary Interstate Highway loop around Atlanta, Georgia, for 63.98 miles (102.97 km). It connects three interstate highways