Editing Interstate 70 (section)

===Illinois===
{{Main|Interstate 70 in Illinois}}
After crossing the [[Stan Musial Veterans Memorial Bridge]], I-70 merges with I-55, while I-64 splits off I-55. When the routes intersect I-270, I-55 stays on its own pavement using the mileposts from the Poplar Street Bridge, while I-70 heads east on I-270's pavement using I-270's mileposts. Because of this arrangement, when I-55/I-70 intersects I-270 from the southeast, the exit number is 20 and, in the opposite direction, it is exit&nbsp;15.

I-70 was rerouted from the Poplar Street Bridge to the Stan Musial Veterans Memorial Bridge north of Downtown St. Louis, which opened in February 2014.

I-70 passes through numerous [[county seat]]s in Illinois, among them [[Vandalia, Illinois|Vandalia]], the state capital from 1818 to 1839. It [[concurrency (road)|runs concurrently]] with [[Interstate 57|I-57]] around [[Effingham, Illinois|Effingham]] and then proceeds east toward Indiana.