What I don't understand is the fact that rear foglamps aren't required in the US (not sure about Canada). They're mandatory here and the original owner of my car had to have one fitted.
To be honest, I do not see that much use for them. Yes, they may help to make the car visible for a bit longer distance, but already with regular tail light that is already far beyond the general visibility in a given fog, so it only makes "drivers" to feel like they can see further than they really can see and consequently drive insanely fast for the condition, smashing into something that does not have lights, like pedestrians and so on.
And where they are really counterproductive is at dark: There they just create a red wall blocking any remaining bits of visibility ahead of the car in front of you that has them on.
But what I do see as a problem is, the "daylight running lights" do not turn the tail lights with them. Consequence is, many drivers forget to turn the main headlights on (mainly in brightly lit cities, or generally because even just the DRL are providing quite sufficient front illumination for slower speeds) and so many cars then drive at night without any tail lights on.
And along the fact that headlights do not have any signal light on the dash whatsoever, it is becoming a problem in the rain - mainly with automatic headlights you have no idea if the main headlights did turn ON or did not. If the tail lights were on also with the DRL, neither of these problems would be problem at all, as if the visibility is good for the driver (that is for his personal judgement and exact conditions), for others it does not matter at all, whether the car has main headlights, or just DRL on at the front... And it would not require anything more complex nor sophisticated in the car automation...
The argument "It is to save power/gas/CO2 emission" is really a BS, with the tail lights consuming barely 2..3W with the LEDs (or even the 10..20W with older incandescents makes no difference at all)