Interstate Highways – By the Numbers

• 46,700:  The approximate number of Interstate highway miles in the United States
• 3,233:     The number of Interstate highway miles in Texas, the most of all 50 states
• 3,100:     The approximate mileage on I-90 between Boston and Seattle – the longest roadway in the Interstate system
• 1956:      The year President Eisenhower signed the Federal-Aid Highway Act, ushering in the age  of the super-highway in America
• 70:          As in I-70, the first Interstate in the country with the first mile constructed in Kansas
• 41:           The number of Interstate miles in Delaware, the state with the fewest
• 1.06:       The mileage of I-375 in Detroit – the shortest official Interstate in the country

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