While two bros who recorded a cyclist were claiming that the guy is a Bay Area legend, we don't recommend you copy him. The cyclist was apparently hanging onto the back of a large truck for a few minutes before finally exiting the freeway.
Then, has everyone been watching "Back to the Future?" A rollerblader in Rio de Janeiro was hanging onto the side of a bus as it made its way across town. Both stunts are very dangerous and not worth risking your life over.