The River Road part of this route is a VERY popular road for sports cars and bikes. In 2018 "Radar Enforced" signs have appeared on River Road. I found a Murmar Township council meeting mulmur.ca/content/council/agendas.../mulmur-speeding-plan-rev-april-2018.pptx (Power Point file) that outlines their plans for 2018. It doesn't look like they are planning photo radar-just increased police presence. I drove River Road one mid-week morning in early June 2018 and didn't see any police or photo radar.
It a nice blend of straights and corners and some nice scenery