Each year, on the third weekend in May, nearly 40,000 runners, walkers, and revelers participate in the annual Bay to Breakers race in San Francisco. The run starts at the Embarcadero on SF Bay. Racers run a distance of 12k over the hills of the city to Ocean Beach and the Pacific Ocean.

This is a vintage SF event. Like many events, it will likely be cancelled due to the coronavirus.

There are elite world-class runners and serious runners that make up most of the participants. There's the serious Hayes Street hill to climb and the flat stretch through Golden Gate Park.

But it's the participants from the "E Group" (the last to leave the starting blocks) and the fun-loving spectators who give the race its flare and notoriety. Costumes are bright and eye catching. There are "caterpillars", groups of 8-10 runners connected by a theme costume. There are even "floats" propelled by foot power.

City leaders keep talking about banning nude racers. Despite the promises, nude racers run and walk right along with Betty Boop, Tahiti Bob, Jungle George and all their pals. It's tradition.

So, viewers be advised that this gallery contains nudity.

Photos, and the details in each, are best viewed individually.