US Route 131 runs north-south midway across the western half of Michigan's Lower Peninsula (the main part of the state).  It's an important route to Michiganders, and to no one else.  The northern end is at US Route 31 in Petoskey.  It heads south as the main north-south highway through Grand Rapids and through Kalamazoo.  From Manton to Kalamazoo, US Route 131 is an expressway comprising the majority of US Route 131's total length.  The southern extent barely pokes less than one mile into Indiana, with the southern end at the Indiana Toll Road carrying Interstates 80 and 90.

My photo for US Route 131 was taken on the northwest side of Constantine, a town south of Kalamazoo in southwestern Michigan. Michigan likes to put trailblazers at an average frequency of every mile, it seems.  At every intersection with a country road, there's a good bet that MDOT put up a pair of trailblazers.  The northbound trailblazer depicted is at the intersection with Youngs Prairie Road. 
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