On hills my recollection is that the up hill traffic has the right of way. The down hill folks need to back up to a wide spot so the others can pass. I have found that not everyone follows this religiously. I have had the up hill traffic back down. Each situation is different.
When on a flat road, where I can see someone coming, I usually find a wide spot to pull over and let them go by. Sometimes we both pull over and then it is th enough go no you go game until one of us go.
Read detailed trip reports, see photos and videos on my travel blog, luinil.com.
Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.