interstate highway
US /ˈɪntərsteɪt ˈhaɪweɪ/
UK /ˈɪntərsteɪt ˈhaɪweɪ/
1.
a major divided highway with controlled access, connecting two or more states, part of the U.S. Interstate Highway System
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We took the interstate highway to get to the next city quickly.
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Construction on the new interstate highway is expected to be completed next year.