Can't wait for the I-70 video, and its long list of interesting control cities, starting off with Baltimore 
Ha! I’m actually most excited for 70. It’s my hometown road and probably my favorite. It may be a 10-parter.
I grew up on 2 cities served by I-70, and a third that's 50 miles due south of it, and I-70 as an interstate have some interesting quirks, including the control cities:
- Baltimore (shoutout to HighwayStar here

)
- DC used to be signed in some places, including at Breezewood. I think the signage for it was removed recently.
- Breezewood
- Actually most of the control cities between St Louis and Breezewood are relatively normal, and what you would expect (Indianapolis, Dayton, Columbus, Wheeling, Washington PA, Pittsburgh)
- Wentzville being used for WB in the St Louis suburbs more and more
- And the general habit of MoDOT switching control cities at every other interchange. Columbia is a common one because of this
- Not sure about Kansas
- In Colorado, there's Limon, a big debate point here. Imo if a city doesn't have a hospital, it's not worth control city status.
- Then in Utah, the various small towns on the route, and the one-off "Las Vegas" sign.