sidelights have been as good as useless
sidelights are as good as useless, you should have dipped headlights (& tail lights) on
being road aware is great – the most important manifestation in this situation should be "****, it's foggy – I should be careful & slow down"
SPray is different again – if there's no car in front, the nature of the spray changes totally, so "I can't see it, but there's obviously a car in front – I should be careful & slow down"
If you're doing well below 50mph, half a mile "plus" away might as well be on the moon. If you see that there's a car 200yds away, you need to know if it's moving or staionary and whether it has its brakes applied – fog lights on doesn't help much with that, possibly hinders
If you're in a line of traffic, trying to see what cars several ahead in the line are up to, fog lights confuse the issue
If visibility is so bad that you can't see standard rear lights at more than 30ft away, get off the road as you're likely to die soon whether or not you're at fault