One time in college they forced us to go on this tour in the city(my city like I hadn't seen the same shit before ) and there was this guy detailed to ensure the drivers didn't drink. We had all gone into a building for a while and when we came back the bus was reeking lol they had finished drinking in the 20 mins.

But I seriously have insane respect for these guys. I've driven in low hills for a bit and its pretty difficult when the turns come fast and its dark, the turns these guys do with a vehicle that heavy is I did this journey Manali-Kaza, there were stretches where standing up was legit difficult it was so steep and they were navigating hairpin bends with something of that weight. I get nervous if I get stuck on the climb of an overbridge in a jam.