While driving in fog/rain/less visibility conditions, the practice of switching on the hazards is only to indicate to the car coming behind to be a bit careful. But in my honest opinion, if you switch on the parking lights and also the rear fog light would be more than sufficient for a car following to notice. Hazards only lead to confusion, especially when you intend to turn.
The rear fog light option, is an option, which most of the drivers are not aware of (including me, I was aware of it only after owning it for an year). The SA in MASS adviced me to use it if driving beyond the prescribed speed limits(say 100+kph).
Also, I see a very common mistake most of the drivers do is to forget to switch off the indicators after a lane change. There is a half switch option in the indicators which again is goes unaware by most of the users.
Ignorance in Bliss sometimes, but reading the manual helps a lot !!
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