Glad somebody added that link, as i cant upload pictures for some reason?
Anyway i am inclined to think that even with the cooling system bled properly one fan wont be enough if your stuck in traffic, make sure you add enough antifreeze as this will help with cooling, but i would be inclined to make the trip back late at night when there is much less chance of getting stuck in traffic, with the system fully bled and being able to keep moving at a reasonable speed, you stand a better chance, also the night temps are also cooler, good luck.