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You have to take bus #2 and travel to the last stop near motorway junction 5 on the west side of the city. Then go straight along the main road. On the left you'll recognize a sing for Pula, Trieste, Ljubljana. You can hitchhike there by the signs (ignore ''no autostop'' signs, it's very hard to have problems with police) on the beginning of the motorway or you can walk along the shoulder of the motorway towards the OMV petrol station for around 1 km where you can ask people. It is a good road to Italy, Ljubljana and also to Austria.