Overtaking a convoy of fuel trucks to Kosovo

Every now and then, before driving into Skopje, you can bump into a long convoy of fuel trucks. Rumour has it that the convoy heads for Kosovo and that it comes from Thessaloníki. There is an odd regularity in which these trucks appear in the streets of Skopje. What this regularity is... nobody I know seems to know. Anyway, in the evening of 14 November the queue of trucks heading west through the Macedonian capital was there again. This time I managed to see the front of it at well - a police car guiding the convoy.