Highways Bypassed by Interstate Highways

[TheGrassGuy]

Isn't this very common? At least here in NJ, almost every US route is paralleled and occasionally concurrent with an Interstate.
I-78 with US 22 between Harrisburg, PA and Newark
I-80 with US 46
I-95 with US 1
I-295 with US 130 between Pennsville and Bordentown

In addition, though they are not Interstates, the Garden State Parkway parallels US 9 between Cape May and Hillside. The Atlantic City Expressway parallels US 30 and US 322.

It might be true in a small state NJ (don't forget I-287 and US 202), but there are a handful of interstates that are just built without any obvious parallels to preexisting routes, such as I-80 in PA (though it does come close to US 62 and US 322 at times).

[US71]

US 66 in Oklahoma was (mostly) bypassed by I-44 and I-40.

LA 1 was generally bypassed by I-49

[US 89]

I-15 follows US 91, which is pretty straightforward.

Except between Virginia, ID and Brigham City, where it replaced US 191 instead.

[CNGL-Leudimin]

Seeing where US 191 runs now, it doesn't appear so. But in fact US 191 ran on a different course from West Yellowstone South (US 20 to Idaho Falls -which was its original route in 1926-, then down what is now I-15 to Brigham City), having only adopted its present route after I-15 was built.

[cwf1701]

In Michigan alone:
US-12 (original routing)
US-16
US-25
US-27

to add
M-76
M-78 (Flint-Lansing)
M-21 (Flint-Pt. Huron)
US-2 (Macanaw Bridge to Canada)
US-10 (Detroit-Bay City)

[roadman65]

Isn't this very common? At least here in NJ, almost every US route is paralleled and occasionally concurrent with an Interstate.
I-78 with US 22 between Harrisburg, PA and Newark
I-80 with US 46
I-95 with US 1
I-295 with US 130 between Pennsville and Bordentown

In addition, though they are not Interstates, the Garden State Parkway parallels US 9 between Cape May and Hillside. The Atlantic City Expressway parallels US 30 and US 322.

It might be true in a small state NJ (don't forget I-287 and US 202), but there are a handful of interstates that are just built without any obvious parallels to preexisting routes, such as I-80 in PA (though it does come close to US 62 and US 322 at times).

That can be argumentive, as it may not closely parallel a US route its entirety it did replace US 6 west of Scranton.   My dad says that in the pre interstate days US 6 was the way to Cleveland and Chicago.  He said that from NYC one would take US 46 to Portland, PA (or later Columbia, NJ) and use US 611 to Scranton to pick up US 6 to go points west.  US 611 between the Delaware Water Gap area and Scranton was not only for locals in Eastern PA once upon a time.

Ditto for US 301 south of Richmond, VA.  Though south of Santee, SC where US 301 and I-95 split for several miles as US 15 takes over to Walterboro for US 17 and its children to take over to Jacksonville, the route from there to Jacksonville area (considering Callahan is in that metro) was still very well replaced by it.  There are plenty of old abandoned road side stands still seen along US 301 between Orangeburg, SC and the GA Border (Savannah River) that were put out of business by the interstate.