 M @-@ 5 is maintained by the Michigan Department of Transportation ( MDOT ) like other state highways in Michigan . As a part of these maintenance responsibilities , the department tracks the volume of traffic that uses the roadways under its jurisdiction . These volumes are expressed using a metric called annual average daily traffic , which is a statistical calculation of the average daily number of vehicles on a segment of roadway . MDOT 's surveys in 2010 showed that the highest traffic levels along M @-@ 5 were the 68 @,@ <unk> vehicles daily between 12 and 13 Mile roads ; the lowest counts were the 17 @,@ 176 vehicles per day southeast of Schoolcraft Road to I @-@ 96 . All of M @-@ 5 has been listed on the National Highway System , a network of roads important to the country 's economy , defense , and mobility . The trunkline is <unk> or eight @-@ lanes wide along the freeway section to the north and west of the Grand River Avenue interchange ; south and east of there it is a four @-@ lane freeway or six @-@ lane highway all the way to I @-@ 96 . 
