Route Description
M-46 is one of three trans-peninsular highways in the Lower Peninsula, starting blocks away from Lake Michigan in Muskegon and running almost to Lake Huron in Port Sanilac. The other two highways that do this are M-55 (Manistee – Tawas City) and M-72 (Empire–Harrisville). The highway is maintained by the Michigan Department of Transportation (MDOT) like all other state trunkline highways in the state. The department tracks the traffic volumes along all state highway highways as a part of its maintenance responsibilities using a metric called average annual daily traffic (AADT). This measurement is a calculation of the traffic level along a segment of roadway for any average day of the year. In 2009, MDOT figured that lowest traffic levels were the 1,855 vehicles used the highway daily near the eastern terminus. The peak traffic volumes were the 30,505 vehicles AADT along the section of M-46 immediately east of the US 31 freeway near Muskegon. The trunkline has been listed on the National Highway System (NHS) between the western terminus and US 31, and between Cedar Springs and the M-53 junction in Sanilac County. The NHS is a network of roadways important to the nation's economy, defense, and mobility.
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