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[NE2]

Note that all the ex-66 loops were signed as I-40 Business from the beginning in 1985: https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003673457.pdf (p. 20). There was no such note for Glenrio: https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003674254.pdf (p. 30). https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003686704.pdf claims that it was, however, signed as a business route by 1990. But perhaps that was an error. Does anyone have any evidence of signage between 1972 and 1990?

[kphoger]

Note that all the ex-66 loops were signed as I-40 Business from the beginning in 1985: https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003673457.pdf (p. 20). There was no such note for Glenrio: https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003674254.pdf (p. 30). https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003686704.pdf claims that it was, however, signed as a business route by 1990. But perhaps that was an error. Does anyone have any evidence of signage between 1972 and 1990?

Thanks for that!  (By the way, you threw me off with the page numbers.  I was looking at the actual document page numbers, not the .pdf page numbers.)

[wxfree]

Of note may be the designation file for the route's previous iteration, from before its mileage was transferred to I-40-BL:

Highway Designation File

STATE HIGHWAY SPUR NO. 504

Minute Order 066067, dated 04/03/1972; Adm. Cir. 036-1972, dated 04/15/1972

Glenrio Spur - From Texas/New Mexico State Line at Glenrio, eastward 0.45 mile over old location US 66 and northward over new connection to IH 40, a total distance of approximately 0.61 mile.  (Deaf Smith County) New Designation.

Had US-66 already been relocated off of this road by 1972?  I don't see anything in the AASHTO database for US-66 in Texas from before 1975, and that was for a relocation onto I-40 at the Oklahoma line.

According to the minute order, I-40 was being built on new location parallel to US 66 and US 66 would be signed along the Interstate.  So it wasn't relocated until the Interstate opened.  The only piece of US 66 moved to the Interstate was the part in Glenrio, at least in this minute order.  It appears it was mostly left in place and signed as business routes until the whole designation was cancelled.  New Mexico wanted to drop their section of the old route, which is rather extensive and very rural, and appears to be maintained in a low condition.  Texas moved the west end of their portion to the Interstate because New Mexico did.  Texas is not eager to drop roads, so they gave the old road a spur number, probably also signed as a business route, as was the common practice.  I think it was 1990 when the business route became an official designation.  It's actually a category of State Highway, like State Highway Loops and Spurs, and is not a category of the parent route if that's a US or Interstate Highway.

The buildings in the area abandoned and the AADT is 40, so it probably costs very little to maintain.  Going out and taking down the signs would probably cost more than leaving it on the books.

[wxfree]

Note that all the ex-66 loops were signed as I-40 Business from the beginning in 1985: https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003673457.pdf (p. 20). There was no such note for Glenrio: https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003674254.pdf (p. 30). https://publicdocs.txdot.gov/minord/MinuteOrderDocLib/003686704.pdf claims that it was, however, signed as a business route by 1990. But perhaps that was an error. Does anyone have any evidence of signage between 1972 and 1990?

According to the minute order, it was signed as Business I-40.  That isn't inconsistent with the 1985 minute order leaving Glenrio out.  US 66 was moved to the Interstate near Glenrio when it opened because New Mexico moved their section to the Interstate.  In the places listed in the 1985 minute order, it was left going through town and signed as business routes.  Glenrio and its spur weren't affected by the cancellation of US 66 because that highway was along the Interstate.