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That varies by state. I know in Raleigh, it's 65 MPH on I-40, and 60 MPH for most of the I-440 beltline. I can't be 100% certain about this, but I believe the lowest speed limit I've ever seen on an Interstate Highway (other than in a construction zone) was 50 MPH.

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15y ago

What else can I help you with?

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