Interstate 170
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- An I-170 used to exist in Baltimore, Maryland.
Interstate 170 is the designation for an interstate route in the St. Louis, Missouri metropolitan area. I-170, also known as the Inner Belt Expressway, is a 11.17 mile highway traveling north-south through the St. Louis suburbs of Hazelwood, Berkeley, St. John, Overland, University City, and Clayton.
I-170 connects to Interstate 270 at its northern terminus and Interstate 64 at its southern terminus; at Exits 7A and 7B, I-170 crosses its parent, I-70. Interstate 170 also provides access to Lambert-St. Louis International Airport.