The public bus from Bumthang to Mongar climbing towards Thrumshing La mountain pass (3780m).
The locals named the buses vomit comet because of the incessant curves that make many passengers sick.

Thankfully the long distance between the valleys ensures that vehicles usually don't meet at the most critical stretch of road: Namling Brak, where the road crosses a rock wall with a sheer 300m drop.