The I - 49 designation went into effect in December 2012 .
In Missouri , US 71 is signed as part of the new section of Interstate 49 from Pineville to the southeast side of the Kansas City metro area .
The Interstate 49     designation went into effect in December 2012 .
In Missouri , US 71 is signed as part of the new section of Interstate 49 from Pineville to the southeast side of the Kansas City metro area .