Unfortunately Jaycyn, no matter how competent a driver you are there is nothing you can do to prevent someone ploughing into the back of you when you are stationery and have nowhere to go in front of you. Have been driving on motorways for a great many years and no matter how well prepared you are there is always that occasion when something looms in front of you. Black smoke at night on the motorway is difficult to detect, one minute you are in the clear next minute you are blind, no matter how quick your reactions if something is hidden in that black smoke you are going to plough into it, with fog you get an inkling that things are changing and adjust your driving accordingly. If someone throws a brick wall in front of you that you cannot see, then an "incident" is going to occur even when driving at the correct speed for what were the "apparent" prevailing conditions.
Regretfully some drivers do not put on their hazard lights when coming to a full stop or when stopped in adverse visibility conditions, some car manufacturers (unfortunately still at the high end price bracket) have a system where emergency braking automatically activates the hazard lights, hopefully this will become a standard feature on all vehicles in the not too distant future.
Whilst these tragic incidents do occur they are thankfully still very rare on our motorway system at the level of this recent tragedy. Our thoughts are with those directly and indirectly involved, our hearts go out to them.