Interstate Highway System Explained

[BobC]

This is an interesting video on how the Interstate Highway system is designed and numbered:

https://www.youtube.com/watch?v=8Fn_30AD7Pk

[sundog964]

Thanks for that. Living in the SF bay area, it confirms some of the odd numbering we have here.

[BobC]

By the way, according to this Reuters article which quotes the DOT, the Interstate Highway system, as many believe, wasn't designed with a one mile straight section every five miles for emergency airplane landings:

https://www.reuters.com/article/fact...-idUSL2N2NQ1IC

[Mtn Charlie]

It is a good explanation of the Interstate "I" system but in neglects the "US" highway system. The "US" system in numbered just the opposite of the "I" system. For example, I-10 traverses the southern US and US-2 traverses the northern US. I-95 goes N/S on the eastern US and US-101 goes N/S on the western US. The "I" system is limited access and the "US" system is open access, but the difference becomes obscure in metropolitan areas, where both may be limited access highways. EDIT: Sundog964, US-101 is an example of a US Highway being limited access in metropolitan areas. It is limited access for over 80 miles from San Francisco to way south of San Jose.

[Wyatt]

Originally Posted by BobC

This is an interesting video on how the Interstate Highway system is designed and numbered:

Very informative, and entertaining. Thanks!

[BarryLS]

I knew the I numbering system had some screwy stuff. That confirms it...