Does US-30 go all the way across Pennsylvania? Or...

The same physical road can be part of more than one route. A northeast to southwest road could be part of a north south route as well as an even numbered east-west route. Some interstates were built exactly on top of the old US Route and now that section of road has both an I number and a US number. I don't think this was ever the case with a toll road though.
 
Some interstates were built exactly on top of the old US Route and now that section of road has both an I number and a US number.

I think what happens more often is that the Interstate parallels the original US route and that route is decommissioned and multiplexed with the interstate.

Looking at historic topo maps you'll often find that US highways had different routes decades ago. A route that in the 1950s went through a town would eventually be rerouted around the town on a new road, which may be an Interstate.
 
They run east-west

The odd numbered US highways run north-south, like US 1.

In general the 1 and 2 digit US highways (like US11) tend to be longer than the 3-digit ones (like US211, which is a branch off of US11).

you are correct... I was just trying to keep it simple...

its also worth saying US Highway numbers are on the opposite end of the numbering spectrum from the Interstates.... aka Interstate 10 is closely paralleled by US 90 . or US1 and I 95, US 31 and I 65.. etc
 
you are correct... I was just trying to keep it simple...

its also worth saying US Highway numbers are on the opposite end of the numbering spectrum from the Interstates.... aka Interstate 10 is closely paralleled by US 90 . or US1 and I 95, US 31 and I 65.. etc

There's also no Interstate 50 or Interstate 60 because they'd be too close to the US 50 and US 60. Or so I've heard.
 
It's been a long time, (1977) that I took 80 to go from Pittsburgh to Harrisburg. That was a big mistake. The scenery was beautiful, especially in one farm section with such a nice view that I just had to pull off to the side and get out and spend a few more minutes taking it in, instead of just passing through. Who ever owned the farm house there has one of the nicest views in the entire country. But 80 is a truck road with way too many heavy trucks taking it to avoid tolls. Way too many hills, and busted up roads from the heavy trucks. Like riding a bucking bronco for way too long. I never took that road again. Probably used more extra gas than the cost of the turnpike toll, took longer, requires much more driving attention, and in general not a present drive at all. The only up-side is the beautiful scenery in a few locations. Maybe nice to see once, but if 80 is as bad as it was back then, it is not worth driving it twice.


Just my humble opinion of 80
 
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