Traveling around Bulgaria can be done by bus, train or taxi, which are all reliable means of travel.  However, they can be difficult for those that don’t speak the local language.  This is why foreigners will have a better time getting around when they hire a car with sat nav.
Travelers will need to be observant of the country’s road rules, and the authorities won’t bother them.  Note that police officers drive white Opel Astra cars with ‘POLICE’ in blue letters painted on them.  It’s also worth noting that motorists should be vigilant while driving, as many roads aren’t very well marked, don’t have defined lanes and are in poor conditions.
However, the issue of roads not being well marked, as well as the fact that signs are posted with the Cyrillic alphabet, won’t be that much of a problem for travelers that get a sat nav system with their car hire.  This technology has been made very user-friendly in recent years, so even new users shouldn’t have a problem entering a destination and following the directions.  Travelers won’t need to be able to read the signs, because the system will tell them the distance they need to go before they turn and then tell them again when they get to the turn.
There are always going to be dangers from driving on foreign roads no matter which country a traveler visits.  However, getting a rental car with sat nav can take a lot of the pressure off when exploring an unfamiliar nation like Bulgaria.