 US 41 is a major highway for Michigan traffic in the Upper Peninsula . The 278 @.@ 769 @-@ mile ( 448 @.@ 635 km ) highway comprises mostly two lanes ; it is undivided except for the sections that are concurrent with US 2 near Escanaba and M @-@ 28 near Marquette . US 41 / M @-@ 28 is a four @-@ lane expressway along the " Marquette Bypass " , and segments of the highway in Delta and Marquette counties have four lanes . The route from the southern terminus to downtown Houghton is part of the National Highway System , a system of roadways considered important to the nation 's economy , defense and mobility . Sections of the trunkline are on the Lake Superior and Lake Michigan circle tours . 
