 M @-@ 81 starts at a junction with M @-@ 13 , with the two directions of each highway separated by a median . This central feature ends for M @-@ 81 immediately east of the intersection as the highway runs east out of Saginaw . The trunkline follows Washington Road easterly through residential subdivisions to an interchange with I @-@ 75 / US 23 in an industrial area of Buena Vista Township . This interchange , exit 151 along the freeway , is built with roundabouts on either side of the bridge that carries Washington Road over the freeway in a variant of the diamond interchange design called a <unk> interchange . After leaving the industrial properties on the east side of I @-@ 75 / US 23 , M @-@ 81 follows Washington Road through a mixture of farm fields and residential subdivisions . North of the community of Arthur , the highway intersects M @-@ 15 ( <unk> Road ) . Further east , M @-@ 81 crosses out of Saginaw County ; across the border in Tuscola County , the highway follows Saginaw Road . 
