A Black Lives Matter caravan of cars took over the upper deck of the bridge.
It brought traffic to a crawl around 6 p.m. Saturday.
The CHP monitored the scene from a helicopter.
RELATED: What is Juneteenth? History, celebrations, future of the holiday celebrating the end of slavery
San Francisco's Japanese community also came together to create art in solidarity with the black community.
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.