Getting a little off tangent here, but I'm reminded of someone who was caught behind an erratically swerving vehicle on a two-lane stretch of the Autobahn. My dad encountered similar behaviour from a driver who was engaged in heated argument with his partner. Needless to say the vehicle in front is basically hogging both lanes.
First let's assume there's always a barrier separating the opposing traffic directions. Now, honestly, if the two-lane stretch were to continue for e.g. hours at the current rate, how many of you would:
a) flash headlamps etc. and attempt to overtake
b) maintain a safe distance and suffer in silence
c) call the cops, whether via a mobile or you had to stop by the roadside to use a public phone
?