High Quality Content by WIKIPEDIA articles! M-99 is a state trunkline highway in the Lower Peninsula of the US state of Michigan. It runs from the Ohio state border, where it connects to State Route 15 (SR 15), north to Lansing, where it terminates at a junction with Interstate 496 (I-496). The highway mainly serves local communities along the route as it passes through farm lands in the southern part of the state. One segment is routed concurrently with US Highway 12 (US 12) in Jonesville while the northern end runs through urban areas on a street named for Martin Luther King, Jr. in Lansing.