In Mongolia they seem to have their own ways of solving merging problems. Other countries would probably use the zippering method, which is the most effective way: there's no need for a traffic light or a police officer to regulate the flow of traffic. All you need is common sense: every car should leave a gap for a car to get into the lane.
In Mongolia they seem to use a different way. That's the dog-eat-dog way. We have an even more straightforward phrase for that here in Hungary: "The stronger dog gets to hump."
The drivers are aggressive as hell, they bend bumpers and fenders, keep honking, but after merging they carry on as if nothing had happened. It seems to be the standard procedure. Russian-built UAZ 4X4s designed for military use seem to fit these traffic conditions perfectly.