A Black Lives Matter caravan of cars took over the upper deck of the bridge.
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It brought traffic to a crawl around 6 p.m. Saturday.
The CHP monitored the scene from a helicopter.
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San Francisco's Japanese community also came together to create art in solidarity with the black community.
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The group "Japantown for Justice" wanted to honor the movement for Black Lives Matter and recognize Juneteenth.
Besides drawing signs, members also built a large black origami crane that says "Black Lives Matter" and "I Can't Breathe".
A group of young Japantown neighbors organized today's event.