Here's the aerial diagram for the upcoming Photo-Radar location on Highway 138, that will be installed about 350 m after the Mercier Bridge heading toward Montreal. (Route 138 eastbound between the Mercier Bridge and Highway 20.) Will monitor 52 000 vehicles a day with max speed of 70 km / h. MTQ previous stats: 86 accidents between 2008-2012, with 24 injuries.
Another proximate South Shore location that will install photo radar:
Here's the aerial diagram for the upcoming location on Highway 30 headed East, between Routes 207-and 209. Will monitor 45 000 vehicles a day,
max speed 100 km / h
Here are the links to find other photo radars or red light surveillance units-
https://www.mtq.gouv.qc.ca/securite-transport/radars-photo-surveillance-feux-rouges/emplacements/Pages/default.aspx