M-45 is a state trunkline highway in the US state of Michigan that is also called Lake Michigan Drive. The highway runs from Agnew near Lake Michigan to the west side of Grand Rapids in the western Lower Peninsula. Lake Michigan Drive continues in each direction from M-45's termini, extending west of US Highway 31 (US 31) and east of Interstate 196 (I-196). In between, the road runs through rural and suburban areas of Ottawa and Kent counties, including the main campus of Grand Valley State University in Allendale. Lake Michigan Drive was originally part of M-50 until the mid-1960s. Previously in the 1920s and 1930s, the M-45 number was designated along a highway in the Upper Peninsula (UP). Route description Lake Michigan Drive starts near Lake Michigan at an intersection with Lakeshore Drive near the Grand Rapids water filtration plant. The road runs east to an intersection with US 31 in Agnew, where the M-45 designation begins. The area is marked by a mix of woodland and agricultural properties. The road runs through rural Ottawa County to Allendale. Through town, Lake Michigan Drive widens to a four-lane divided boulevard with a median. East of the main part of town, M-45 passes the main campus of Grand Valley State University before crossing the Grand River. At 24th Avenue, the highway loses its median and gains a central turn lane. The landscape becomes more suburban as the highway crosses into Kent County near the M-11 intersection in Walker. From here east to the terminus in Grand Rapids, the road is lined with residential subdivisions and commercial properties. At Bridge Street, Lake Michigan Drive turns to the southeast and approaches John Ball Zoological Garden. M-45 ends at the interchange with I-196. Lake Michigan Drive continues east to its end where it becomes Pearl Street near the Grand River downtown. The Michigan Department of Transportation (MDOT) maintains M-45 like all other parts of the state trunkline highway system. As part of these responsibilities, the department tracks the volume of the traffic using its roadways which is expressed using a metric called average annual daily traffic (AADT). This is a calculation of the traffic levels for a segment of roadway for any average day of the year. In 2009, 4,910 vehicles used the section of M-45 near the western terminus daily. Near the interchange with I-196, 32,376 vehicles were observed along Lake Michigan Drive