How do engineers make ROAD SIGNS look the same?

What makes traffic-control devices uniform from coast to coast? It's all thanks to a magical book engineers use called the Manual on Uniform Traffic Control Devices (MUTCD).

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

"CA Manual on Uniform Traffic Control Devices (CA MUTCD)," California Dept. of Transportation. https://dot.ca.gov/programs/safety-pr...

"A Century of Traffic Control Devices and What Lies Beyond," Transportation Research Board; Hawkins and Carlson. https://onlinepubs.trb.org/onlinepubs...

"Sign Legibility," California Highways and Public Works Magazine (Jan. 1951); Moskowitz and Morgan. https://cdm16436.contentdm.oclc.org/d...

"The Stop Sign Wasn't Always Red," The New York Times Magazine (Dec. 9, 2011); Greenbaum and Rubinstein. https://www.nytimes.com/2011/12/11/ma...

"Manual on Uniform Traffic Control Devices," Wikipedia. https://en.wikipedia.org/wiki/Manual_...

"Road signs in the United States," Wikipedia. https://en.wikipedia.org/wiki/Road_si...

"Vienna Convention on Road Signs and Signals," Wikipedia. https://en.wikipedia.org/wiki/Vienna_...

"Convention on Road Traffic," United Nations. https://treaties.un.org/doc/Publicati...

"Fluorescent Strong Yellow-Green Signs For Pedestrian/School/Bicycle Crossings: Results of New York State Study," N.Y. State Dept. of Transportation; Dhar and Woodin. https://ntlrepository.blob.core.windo...

"I-10 Tune Up Pavement Rehabilitation," California Dept. of Transportation. https://dot.ca.gov/caltrans-near-me/d...

"Federal Government Does Not Heart Cuomo's 'I Heart NY' Signs," The New York Times (Feb. 1, 2018); Sarah Maslin Nir. https://www.nytimes.com/2018/02/01/ny...

"I (No Longer) Love New York? Feds Make State Take Down Tourism Signs," CBS New York (Nov. 9, 2018). https://newyork.cbslocal.com/2018/11/...

"Business Sign Eligibility," State of California (via Westlaw). https://govt.westlaw.com/calregs/Docu...

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Time sections:
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Introduction (0:00)
History of the MUTCD (3:15)
Red Signs (6:19)
White Signs (8:14)
State Variations (10:38)
Yellow Signs (11:28)
Green Freeway Signs (15:00)
Green Street Signs (18:55)
Blue General Signs (21:26)
Blue Specific Signs (22:54)
Brown Signs (25:27)
Conclusion (26:48)