Yes, I've been studying a lot of Texas maps and documents lately. Was Jefferson part of US 80? Was it a part of the pre-US 80 road? Was it ever US 80B? Or is it just a city street that has nothing to do with US 80?
I don't think Jefferson was ever a numbered road west of Dallas.
Jefferson was an interurban electric railway.
Jefferson follows an interurban line that no longer exists. In Oak Cliff, it ran down the middle of the street. It appears to me that Jefferson, especially the western parts, could have been a relief route for US 80. It's goofy how Jefferson and US 80 run parrallel so close together in Grand Prairie and Arlington, they are on opposite sides of the UP mainline. Makes for a lousy, dysfunctional setup if you ask me. I've driven in the area.
The portion of Jefferson W of Loop 12 is very strange. See Pic.
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi1209.photobucket.com%2Falbums%2Fcc395%2FBrian5561%2F111711cc005.jpg&hash=8b964b683906cdb576c5979ff472f7ce81184888)
Also, see what it looks like E of Loop 12.
http://maps.google.com/maps?q=State+352+TX&hl=en&ll=32.741018,-96.901765&spn=0.012074,0.025063&sll=37.0625,-95.677068&sspn=35.631106,79.013672&t=h&hnear=Texas+352,+Dallas,+Texas&layer=c&cbll=32.741018,-96.901765&panoid=DKLhBMURXz8HKkGtknNB_w&cbp=12,315,,0,0&z=16 (http://maps.google.com/maps?q=State+352+TX&hl=en&ll=32.741018,-96.901765&spn=0.012074,0.025063&sll=37.0625,-95.677068&sspn=35.631106,79.013672&t=h&hnear=Texas+352,+Dallas,+Texas&layer=c&cbll=32.741018,-96.901765&panoid=DKLhBMURXz8HKkGtknNB_w&cbp=12,315,,0,0&z=16)
Here is part of the interurban where it went over a freight rail line.:
]http://maps.google.com/maps?q=State+352+TX&hl=en&ll=32.737822,-96.898076&spn=0.001509,0.003133&sll=37.0625,-95.677068&sspn=35.631106,79.013672&t=h&hnear=Texas+352,+Dallas,+Texas&layer=c&cbll=32.737822,-96.898076&panoid=5WlDIFM4okZx9DPjaR536w&cbp=12,28.41,,0,0&z=19] (http://maps.google.com/maps?q=State+352+TX&hl=en&ll=32.737822,-96.898076&spn=0.001509,0.003133&sll=37.0625,-95.677068&sspn=35.631106,79.013672&t=h&hnear=Texas+352,+Dallas,+Texas&layer=c&cbll=32.737822,-96.898076&panoid=5WlDIFM4okZx9DPjaR536w&cbp=12,28.41,,0,0&z=19)