Southern segment In 2013 US 31 was rerouted onto a new bypass around Kokomo and the designation along the old bypass, built as a relocated US 31 in 1952, became SR 931.
Northern segment In 2014 the segment of US 31 freeway from
US 30 near
Plymouth to
US 20 (
St. Joseph Valley Parkway) in
South Bend opened, and the segment of what had been US 31 in
St. Joseph County outside of South Bend became SR 931. This segment had been expected to be removed from the state highway system in mid-2018. The bypassed portion in
Marshall County was transferred to the county and to the town of
La Paz rather than being retained by the state. ==Major intersections==