Vehicle markings
			 
			 
			
		
		
		
			
			Hello, Brink: 
 
This sign was fairly common on C/F15 WIRE vehicles of the Royal Canadian Corps of  in the 50s, 60s and up to the early 70s in Canada. 
 
Domestically, the  colour was white, not red as in your post. as if spray-painted over with a pre-cut template. (Using up surplus can s of paint held in inventory at the local LAD?).  
 
This sign was mandatory at the time, in order to conform to Highway Traffic Act regulations, in Ontario. 
 
Those were the "good ol' days" when it was illegal for a civilian vehicle to disrupt a military convoy on the highway. Military vehicles at the time had absoute right of way! 
 
Since your scan shows the text in red, this might reflect the fact that, since Signal Corps unit identifiers were in red, perhaps some-one was just assumed that various other applicable vehicle signs should be in red as well.
		 
		
		
		
		
		
		
			
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				PRONTO SENDS
			 
		
		
		
		
		
	
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