 In South Haven Township, M-140 connects the South Haven Area Regional Airport with the I-196/US 31 freeway; north of this interchange, the highway continues as Business Loop I-196.M-140 is maintained by the Michigan Department of Transportation (MDOT) like other state highways in Michigan.MDOT's surveys in 2010 showed that the highest traffic levels along M-140 were the 10,176 vehicles daily near in Watervliet; the lowest count was 1,536 vehicles per day along Pokagon Road, on average.