Luddjte .... that looks like fun ..... forty-ish years ago Bulgaria was a disturbing place to drive across ..... not a good feel ... you could get a 32 hour transit visa .... I remember we didn't use that route returning from Istanbul (coming back via Greece wasn't without issues .... they were having one of their periodic times of tension and I remember us riding across a very long exposed bridge with Turkish guns pointed at our backs and Greek ones at our front ) ..... but I'm talking about potholes you rode down one side and rode up the other

K