San Francisco is starting to experiment with minor changes: adding speed bumps that don't affect the normal flow of traffic, but get in the way of people doing

San Francisco is starting to experiment with minor changes: adding speed bumps that don't affect the normal flow of traffic, but get in the way of people doing doughnuts: https://www.sfchronicle.com/sf/article/This-S-F-intersection-got-some-unusual-speed-17489720.php https://www.sfchronicle.com/sf/article/This-S-F-intersection...