crowd of people and parked motorbikes gathered in the street in front of a large sound system on the back of a truck

crowd of people and parked motorbikes gathered in the street in front of a large sound system on the back of a truck. Some people are waving small Indonesian flags. Some people are on top of the speaker stack. A street sign above the crowd indicates directions to Juwana/Rembang-Surabaya and Jepara/Tayu. The music is loud. People appear to be enjoying themselves.