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That depends on which state you had in mind. In Colorado, it's 70 for most of it, though it slows down to 65 through Colorado Springs, and down to 55 in some parts as you're going through the Denver Metropolitan area.

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13y ago
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12y ago

On rural areas it varies from 70 to 75 MPH.

On urban areas it varies from 55 to 65 MPH.

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