Where abouts was this. My daughter is in a Owen Sound and I go to Meaford area. Been down lots of different roads but not like in the film. Or should I say vide.
They're all over the place out there. If you download GaiaGPS (there is a free 3 month trial found on this forum somewhere) and add "Canada backroad mapbook" you can see all the small roads and trails. Or just buy a paper book copy of it from Amazon. I found these spots by looking at the map and marking them on the GPS. Just keep in mind that you should mark several spots down because there is a 50/50 chance that there will be no way to access a certain road or trail.
The areas this was filmed in was mostly south west of Blue Mountains
Some of the roads that say "no exit" do indeed have an exit, or other roads that say "no winter maintenance". They are just not meant for normal cars to pass through, but they are in most cases public roads.
Small roads that don't show up on a map and have no signs are likely private so best to keep off those.