Hi, If this is an unclassified highway then how can it be a toll road? Where are the tolls collected and by whom?

Are you sure you've tagged the correct speed limit, when was it reduced to 30? 
 
Where is the maxspeed:advisory=20 posted on this highway, because all OSM data must be verifiable? 

I'm pretty sure the max-width is much more than 2.5m (8.25 feet). 

The tag passing=difficult is subjective depending on the vehicle and at the passing places it's very easy.

Regards Bernard