High Quality Content by WIKIPEDIA articles! Interstate 275 (I-275) in the US state of Michigan is an Interstate Highway that functions as a western bypass of the Detroit metropolitan area. The Michigan Department of Transportation (MDOT) maintains it as a component of the larger state trunkline highway system. The freeway runs through the western suburbs near Detroit Metropolitan Wayne County Airport. Along its routing, I-275 crosses several area rivers and rail lines. According to the Federal Highway Administration (FHWA), the length is 29.97 miles (48.23 km) while MDOT reports the length at 35.026 miles (56.369 km), a discrepancy due to a disagreement over the northern terminus.