As far as I know, Richmond Hill is a separate municipality and what applies in Vaughn would be irrelevant in Richmond Hill.
Try contacting the by-law department of the Town of Richmond Hill.
Telephone: (905) 771-0198
Fax: (905) 771-2508
E-mail: bylaw@richmondhill.ca
Also, here is Richmond Hill's fire route bylaw:
http://code.municipalworld.com/richmondhill/1090.pdf
I would ask for clarification of Section 1090.2.7, which states that "Fire Route signs as described in Schedule 'A' shall be placed at each limit of a prohibited or restricted area, and they shall display single-headed arrows pointing in the direction in which the regulation is in effect." [emphasis mine]
I'm not sure if this means that signs need to be placed at both sides of the roadway, because the bylaw defines the fire route as the entire private roadway. Technically, the sides of the roadway are limits, but the section could be referring to limits as they run parallel to the roadway.