road. The name "Borman Expressway" does not apply eastward beyond the toll road interchange. The freeway passes over the toll road, before leaving Lake Station and entering Portage. In Portage, the Interstate passes over US 20 and begins to parallel US 20, before having an interchange with SR 249. East of SR 249, the highway leaves Portage and enters Burns Harbor, before passing under SR 149. I-94 has a cloverleaf interchange with US 20, before entering Porter. While passing through Porter, the highway passes over the Norfolk Southern Chicago Line. After Porter, the road enters Chesterton and has an interchange with SR 49. East of SR 49, the freeway leaves Chesterton, entering rural Porter County before entering LaPorte County. The Interstate has an interchange with US 421 just south of Michigan City. The road curves to the northeast, bypassing Michigan City to the southeast, having an interchange with US 20. After US 20, I-94 passes over a Chicago South Shore and South Bend Railroad track, before leaving the Michigan City area and entering Michigan. The segment of freeway between US 20 and the Michigan state line has the lowest AADT on I-94 in the state of Indiana, at 37,179 vehicles. History The expressway now known as the Borman was originally known as the Tri-State Highway, and construction of the expressway began in 1949. The designation went through the Kingery Expressway and eventually linked with the Tri-State Tollway in Illinois. It was originally designated SR 420 in Indiana. US 6 diverged at Calumet Avenue south and ran on Calumet Avenue and Ridge Road. At various times, the expressway was extended from Indianapolis Boulevard to Burr Street, then to Georgia Street east of Broadway, and eventually to the toll road. Some time after the enactment of the Interstate Highway System, the expressway was designated as I-80, I-90, and I-294, and the I-94 designation was applied to the Indiana Toll Road west of where its interchange with the Borman was eventually built. The expressways were renumbered around 1965 to avoid the implication that through traffic must change roads to stay on I-90 or I-94, resulting in I-90 being moved to the Indiana Toll Road, I-94 being moved to the Borman, and I-294 being cut back to the Tri-State Tollway and no longer entering Indiana. US 6 was extended along the Borman to Ripley Street at that time (its earlier alignment in this area