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* Odd numbered one- and two- digit interstates under 100 transverse the country north to south. Higher numbers are further east and lower numbers are further west. Those ending in 5 are typically longer, transversing nearly the entire country.
• Three-digit numbered interstates are generally localized highways that intersect with a one- or two-digit interstate. They share the last two digits with the main highway, and run either near or off of that highway.