Federal:   

MUTCD- 
https://mutcd.fhwa.dot.gov/kno_11th_edition.htm     

California :   

California Current MUTCD- 
https://dot.ca.gov/programs/safety-programs/camutcd   

Cal-Trans MUTCD Sign Spec Chart- 
https://dot.ca.gov/programs/safety-programs/sign-specs   

CA MUTCD Sign Chart Link- 
https://dot.ca.gov/programs/safety-programs/sign-charts     

Arizona: 

AZ Manual for Approved Signs- 
https://azdot.gov/business/engineering-and-construction/traffic/arizona-manual-approved-signs     

Nevada:   

Nevada Department of Transportation Sign Supplement Handbook 2006- https://www.dot.nv.gov/home/showpublisheddocument/4462/636190448015930000