The most direct line of travel through a city is designated by a twodigit highway number. Connecting or bypass routes that often go around a city have a threedigit number.Every state capital is served by the interstate highway system except for five: Juneau, Alaska; Dover, Delaware; Jefferson City, Missouri; Carson City, Nevada; and Pierre, South Dakota.The longest interstate highway is I90, from Seattle to Boston, at 3,085.27 miles. The shortest is I97 from Annapolis to Baltimore, Maryland at 17.57 miles.Even highway numbers run eastwest. Odd highway numbers run northsouth.There is only one state without an interstate highway, Alaska

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