The Town of Mount Royal is a bit of a gated community. The fence was put up along l'Acadie Blvd. apparently to keep children from running into traffic. Although many suspect it was actually put up to keep the low-income immigrant Park Extension residents out. (
http://marcellodicintio.com/tag/parc-extension/)
Here is a satellite photo in which you can easily tell which part is TMR and which is Park Ex.
