Not quite zero, there are some speed bumps that I notice in NYC where the bouncing motion of the bikes has worn additional bumps in the speed bump.
Of course, you don't really need the speed bumps in the bike lane. I assume it's there because people will drive around it if it doesn't cover the entire road surface. (Protected bike lanes would fix that, but I'm not really a protected bike lane proponent, so we'll pretend I didn't mention that.)
Of course, you don't really need the speed bumps in the bike lane. I assume it's there because people will drive around it if it doesn't cover the entire road surface. (Protected bike lanes would fix that, but I'm not really a protected bike lane proponent, so we'll pretend I didn't mention that.)