The Logic Behind the Interstate Highway Numbering System in the Contiguous United States

@everydayengineering

how are interstate highways numbered in the US? ##engineering ##civilengineering ##highway ##interstate ##road

? Jazz Bossa Nova for breakfast, etc.(880466) – NakayamaNorikazu

Everyday Engineering, a channel devoted to infrastructure education, explained the logic behind the interstate highway numbering system within the contiguous United States. Of course, there are a few exceptions such as those in Texas, Pennsylvania, and California. Additionally, Alaska, Hawaii, and Puerto Rico each have a system of their own.

In the US if the route is odd it’s a North/South route with the lowest numbers on the West coast and the highest numbers on the East coast. If the route number is even, it’s the East/West route, with the lowest numbers in the South and the highest numbers in the North. …and finally, just to confuse you, even more, Alaska, Hawaii, and Puerto Rico have their own numbering systems.

via Digg

Lori Dorn
Lori Dorn

Lori is a Laughing Squid Contributing Editor based in New York City who has been writing blog posts for over a decade. She also enjoys making jewelry, playing guitar, taking photos and mixing craft cocktails.