I'm sure this varies by jurisdiction, but I really wish my local police department (in Waterloo region) were willing to put even the slightest effort toward general road safety. As a four season bike/eskate commuter who wears a gopro, I am yelled at, swerved at, I witness drivers running stop signs, exiting driveways without looking where they're going, making RTOR without looking where they are going, driving at people walking in crosswalks, and using their phones at stoplights.

I have recorded lots of videos of these behaviours, many with plate and driver face clearly visible, and my local police service just has zero interest in following up on it. There are hotspot intersections I've informed them about where they could set up shop and nail 10-20 drivers an hour for convictions with tickets ranging from $200 to $1000, but I guess they're too busy idling in parking lots waiting for that high priority call to come in.

So, driving high is totally a problem and going to be increasingly a problem, especially in Canada. But based on what I see in my community, it's not clear that the police have any interest at all in proactive enforcement, especially in service of road safety.