dgpcolorado
high altitude member
I think I read that H3 in Hawai'i is now considered the most expensive. Nevertheless, I watched I-70 through Glenwood Canyon get built over more than a decade. It was a fascinating process to watch as the freeway got extended and the remaining stretch of two lane US 6 got shorter. It got a lot of criticism from budget hawks in Congress for the expense. But it sure is gorgeous engineering. When it isn't covered by rockfall...I have (and I was looking forward to it again - but I'll be back in the summer headed to Salt Lake City). I always tell people "When you think interstates are boring and that you don't see anything fascinating without taking back roads then take I-70 thru Glenwood Canyon."
I think I saw somewhere that the 12 mile stretch thru Glenwood Canyon is the most expensive interstate ($/mile) ever built?
Here in mountain Colorado rocks on the road are a routine sight, especially this time of the year with freeze/thaw temperatures loosening them.