Why is the word "LIMIT" missing on Oregon's "Speed Limit" signs?

White regulatory signs need strict uniformity, so police can legally enforce them. So how does Oregon get away with "Speed Limit" signs which are missing a word? And why do they make the signs that way?

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Sources cited:
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"Manual on Uniform Traffic Control Devices," Federal Highway Administation (2009). https://mutcd.fhwa.dot.gov/htm/2009r1...

"Manual on Uniform Traffic Control Devices," Oregon Dept. of Transportation. https://www.oregon.gov/ODOT/Engineeri...

House Bill 3402, 78th Oregon Legislative Assembly (2015)

"Traffic code of Oregon no longer sets speed limit," The News Review, Apr. 4, 1931.

"New speed limits and laws listed," Greater Oregon. Apr. 10, 1931.

"Reckless driver and speed curb urged by Snell," Medford Mail Tribune. Aug. 29, 1937.

"Oregon officials eye basic rule change," The Eugene Guard. Dec. 7, 1953.

"Fixed speed limit given backing at Salem hearing," The Oregon Statesman. Jun. 5, 1958.

"Commission votes to keep basic state speed law," The News-Review. Jul. 3, 1958.

"Speed law has 2 major parts," The Eugene Guard. Oct. 1, 1962.

"Speed limit law not supported," The Capital Journal. May 31, 1967.

"Salem cracking down on speeding buses," The Capital Journal. Sep. 11, 1969.

"To conserve energy on the Nation's highways," Public Law 93-239. Jan. 2, 1974.

"Basic speed rule still in effect, rules state court," The Capital Journal. May 21, 1979.

"Be precise with speed signs," The Lebanon Express. Jan. 28, 1998.

"Boosting speed limit involves more than signs," Albany Democrat Herald. Aug. 14, 2015.

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