Interstate 70 in Missouri
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Interstate 70 (I-70) in the US state of Missouri is generally parallel to the Missouri River. This section of the transcontinental Interstate begins at the Kansas state line on the Intercity Viaduct, running concurrently with US Route 24 (US 24), US 40, and US 169, and the east end is on the Stan Musial Veterans Memorial Bridge in St. Louis.
I-70 in Saline County
I-70 west of St. Louis; shown here is rush-hour traffic congestion. Since this photograph was taken, this section has been widened to four lanes in each direction.
Prior to 2014, I-70 traveled through downtown near the Gateway Arch. Now, this section is signed as I-44.
U.S. Route 40 in Missouri
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U.S. Route 40 (US 40) in the state of Missouri is a U.S. highway that runs from Kansas City to St. Louis. Outside of Greater St. Louis, much of the route either parallels or runs along I-70. East of Wentzville in Greater St. Louis, the route runs along I-64.
One of several interchanges on the Alphabet Loop, located northeast of downtown
The expressway was originally not signed as an Interstate.