From The National Academies:
This year marks the 50th anniversary of the creation of the U.S. Interstate Highway System, which is considered one of the greatest engineering achievements of the 20th century.
- The longest Interstate is I-90, which runs from Boston to Seattle, a distance of 3,081 miles. At 75 mph it would take you 41 hours to cover that distance non-stop. The second longest is I-80, which covers the 2,907 miles between New York City and San Francisco.
- Interstates 5, 10, 15, 20, 25, 35, 40, 70, 75, 80, 90, 94 and 95 are all more than 1,000 miles long.
- The shortest Interstate is I-878 in New York City, which is all of seven-tenths of a mile long. That’s 3,696 feet.
- The highest Interstate route number is I-990 north of Buffalo, NY. The lowest is I-4 across Florida.
- The only state without any Interstate routes is Alaska.
- Interstates carry nearly 60,000 people per route-mile per day, 26 times the amount of all other roads, and 22 times the amount of rail passenger services. Over the past 40 years, that’s the equivalent of a trip to the moon for every person in California, New York, Texas, and New Jersey combined.
More here.