U.S. Route 40 in Missouri
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In the U.S. state of Missouri, U.S. Route 40 travels east-west across the center of the state, parallel to Interstate 70.
US 40 enters Missouri in Kansas City along a concurrency with I-70. It leaves I-70 at exit 6 and follows Van Brunt Boulevard for a short distance before turning east and crossing I-70 again at exit 7A. US 40 parallels I-70 to the north through Kansas City until exit 11, where it crosses and parallels it to the south through the suburbs of Lee's Summit, Independence, Blue Springs and Grain Valley before rejoining I-70 at exit 24. An older alignment caries the designation "Old US 40".
US 40 stays with I-70 until Boonville, where US 40 leaves at exit 101, along with Business Loop 70. Both designations follow Ashley Road, before US 40 leaves and heads north along Main Street. After crossing the Missouri River in Boonville, US 40 turns east before rejoining I-70 at exit 121, at the outskirts of Columbia. The two routes remain concurrent until exit 210B in Wentzville.
From Wentzville, US 40 joins US 61 and heads southeast. The two US routes add I-64 before crossing the Missouri River over the Daniel Boone Bridge in St. Charles. US 40 leaves the state in St. Louis on the Poplar Street Bridge across the Mississippi River along with I-70, I-55 and I-64.
Until 1926, US 40 in Missouri was Route 2.[1]
On January 2, 2008, five miles of US 40 in St. Louis was closed eastbound and westbound from Missouri Interstate 170 to Missouri Interstate 270. It will be closed until December 31, 2008. On January 2, 2009, another five-mile section will close both ways from I-170 to the Kingshighway exit in the city. [2][3]
