There is a guy that stands on a corner telling buses, minis, trufis and taxis which way to go. He watches and counts how many go in each direction so he can assume in which direction they'll be able to pick up more people. Drivers typically tip him for his good advice, and that is how he makes his living.
In the early 90's, when the Death Road was in full service (200-300 people a day), a man stood on one of the more dangerous blind corners and directed traffic with a red and green sign. Drivers tipped or gave food. It started a trend and seven more human traffic lights sprang up along the road.
In other news, I am officially a trained guide for the "World's Most Dangerous Road," I played paintball with the whole Gravity team and made 60 balls last 6 games and was one of the last on the field every game, and I did four runs down a very very very steep and gnarly downhill trail and lived to tell you about zebras directing traffic.