not sure if it's really worth asking it.. but as asking is for free.. ;-) :
My mexican hotel manager (in Cancun) just warned me of the main roads from Oxaca city to the coast and the more solitary parts of the coastal road itself in Oxaca state and west of it. German foreign ministry states that "in the past" there were armed assaults on solitary roads in Guerrero, Oaxaca and Chiapas. I can't find any recent reports on such assaults, so it looks like being perfectly safe as long as you travel at daytime.
Do you ask bus / truck drivers for the saftety on the road ahead? Or do you even go in a convoy with those guys on certain streches? (This is what my hotel manager recommended... :-))
Any comments welcome
BMW F650 \'99