Utah
Colorado (PART 1/PART 2/PART 3/PART 4)
Kansas (PART 1/PART 2/PART 3)
Missouri (PART 1/PART 2)
Illinois (PART 1/PART 2)
Indiana
Ohio
West Virginia
Pennsylvania
Maryland
In Breezewood, PA, I-70 has no direct connection to the Pennsylvania Turnpike (I-76). Instead, it stops at US 30 and travels a short distance on the surface road to the Turnpike's connecting ramps.
I-70 ends at a Park & Ride lot just short of the Baltimore city line. Originally, it was planned to extend to I-95 and produce a spur route into downtown, called I-170. When this extension was cancelled, part of I-170 and the junction with I-95 had already been built. Today, US 40 follows the path of the old I-170.
In Frederick, MD, I-70 was split into two branches: I-70N, which led into Baltimore, and I-70S, which took a path towards Washington, DC. I-70N is now I-70, and I-70S is now I-270. The I-70S designation was also used at one point for the current I-70 freeway between New Stanton and Washington, PA (I-70 originally went through Pittsburgh; its route has been incorporated into I-76, I-376, I-79 and I-279).
I-670 in Kansas City is sometimes referred to as "Alternate I-70," making it the only "alternate" interstate in the nation. Also in Kansas City, the famed "Alphabet Loop" uses every letter of the alphabet as a suffix of Exit 2, except for I, O and Z.
The Eisenhower Tunnel in Colorado is the highest vehicular tunnel in the world, as well as the longest land tunnel.
What had been planned as I-470 around Denver exists as three routes: CO 470 (main route), E-470 (eastern extension) and W-470 (western extension). Together, the routes are often referred to as the "470s." Currently, there are no plans to upgrade the routes to Interstate status, and shields for I-470 do not exist in Denver.
There is no Interstate 570 in real life, but the number has been immortalized in a fictional "South Park" script that has become a hit with road fans everywhere. As the story goes, the new freeway is a spur off of I-470, and its planners, Kyle and Stan, build exits for their houses. Of course, Kenny is killed near the end of the episode.