Originally Posted by
Swanhunter
Baltics and Poland/Czeck/Slovakia/Slovenia/Croatia wouldn't worry me, Romania and Bulgaria more marginal.
I haven't driven in Slovenia, Croatia or Bulgaria yet (will be doing Slovenia and Croatia soon), but Poland/Czech/Slovakia did not bother me either.
As for whether a car can be driven in other countries etc, when we rented a car in Prague and went driving to various countries, I recall that the rental vehicle had some restrictions on which countries it could be taken into.
Romania - I wouldn't want to drive in Bucharest, because of other drivers. I've had far too many near-collisions (albeit minor) in taxis. Road conditions are poor too.