M-3 and M-29. North of 26 Mile Road, the freeway exits the northern suburbs and passes into farmland in The Thumb region. South of Michigan Meadows Golf Course, I-94 crosses County Line Road and enters St. Clair County. The freeway continues northeasterly as far as Marysville before turning northward near St. Clair County International Airport. From there, it runs roughly parallel to the St. Clair River. The Interstate travels along the western edge of residential areas for Marysville and Port Huron as it continues northward. Immediately west of downtown Port Huron, it intersects I-69; the two freeways merge and turn first east and then north through an interchange that also features connections to BL I-69. I-94/I-69 turns back to the east about north of their confluence to span the Black River north of downtown. On the eastern bank of the river, there is one final interchange for M-25 and BL I-69/BL I-94 before the freeway reaches the toll and customs plazas for the twin-span Blue Water Bridge. Past these plazas, I-94/I-69 ascends the approach to the bridge which crosses the St. Clair River to Point Edward (Sarnia), Ontario. At the international boundary at the center of the river, the Interstate designations jointly terminate, becoming Ontario Highway 402. History Predecessor highways The first major overland transportation corridors in the future state of Michigan were the Indian foot trails. One of these, the St. Joseph Trail, followed the general route of the modern I-94 across the state from the Benton Harbor–St. Joseph area east to the Ann Arbor area. The State Trunkline Highway System was created on May 13, 1913, by an act of the Michigan Legislature; at the time, Division 6 corresponded to the rough path of today's I-94. In 1919, the Michigan State Highway Department (MSHD) signposted the highway system for the first time, and three different highways followed sections of the modern I-94 corridor. The original M-11 ran from the Indiana state line north to Coloma where M-17 connected easterly to Detroit. The third highway was M-19 from Detroit northeast to Port Huron. On November 11, 1926, the United States Numbered Highway System was approved by the American Association of State Highway Officials (AASHO), and the original route of US 12 replaced the highways from the state line northeasterly to Detroit; US 31 overlapped the highway between St. Joseph and Watervliet. The remainder of the future I-94 corridor was