The one and only reason for them to run radar there is profit. The limit is absurdly low in that particular area, and it is kept that way so that the RCMP can hide behind a bush on nice days (and around midnight on temperate evenings, apparently) and ticket people entering the city.

They will stand hidden behind foilage until they find a mark, then suddenly step directly into traffic with their arm raised. Nothing more than their high visibility vest and inflated sense of self righteousness to protect them.

...and it finally came to a head.