The historical city of Pleven in North Bulgaria is well connected to many destinations in Bulgaria. The timetables can be found here (in Bulgarian, use Google translate):
There are several taxi companies a tourist can trust while he/she is in Pleven, the situation has changed a LOT since the previous review written several years ago. These companies even reject your call and call you immediately after that at their expense. Their cars have taximeter and you won't get lied. Such companies are Express Taxi (cell phone number 0885998888), Rio Taxi ( cell phone 0885035555), Orion Taxi (835454 and 825454) and Svetlina Taxi (8989). The prices are usually 0.39 lv per km during the day and 0.49 lv per km after 9.00 pm till 6.00 am.
There are also trolleybuses in Pleven you can use to travel around the town, but their routes are not so many - in fact i think there are 13 routes(trolleys with numbers 3, 4, 5, 6, 7, 8, 9, 12, 13, 57, 93, 94, 97), but most of them aren't so regular. The tickets are bought inside the trolleybus and costs 0.50 lv no matter what the distance is.
If you have more questions regarding the transportation in Pleven, feel free to contact me - I will be more than happy to help you.
Now this is a tricky situation , those guys out there driving their private cabs(taxis) are basically ready to rip your head off . Unfotunately this is the easiest way to get anywhere in town and there ain't no way you can avoid them, however DON NOT tip them because they have already added it into your bill several times.
Good luck and have fun .::)))))