<Tr> <Th> Toll </Th> <Td> $2.00 per axle for passenger vehicles ($4.00 per car). $5.00 per axle for motor homes, and commercial vehicles . </Td> </Tr> <Tr> <Td_colspan="2"> The Mackinac Bridge connects St. Ignace and Mackinaw City . </Td> </Tr> <P> The Mackinac Bridge (/ ˈmækɪnɔː / MAK - in - aw) is a suspension bridge spanning the Straits of Mackinac to connect the Upper and Lower Peninsulas of the U.S. state of Michigan . Opened in 1957, the 26,372 - foot (4.995 mi; 8.038 km) bridge (familiarly known as "Big Mac" and "Mighty Mac") is the world's 19th - longest main span and the longest suspension bridge between anchorages in the Western Hemisphere . The Mackinac Bridge is part of Interstate 75 and the Lakes Michigan and Huron components of the Great Lakes Circle Tours across the straits; it is also a segment of the U.S. North Country National Scenic Trail . The bridge connects the city of St. Ignace on the north end with the village of Mackinaw City on the south . </P> <P> Envisioned since the 1880s, the bridge was designed by the engineer David B. Steinman and completed in 1957 only after many decades of struggles to begin construction . </P>

What kind of bridge is the mackinac bridge