It takes a while to figure out the traffic flow in Berkeley, but basically most streets except for main arterial roads have some form of periodic traffic calmin

It takes a while to figure out the traffic flow in Berkeley, but basically most streets except for main arterial roads have some form of periodic traffic calming. So some of the bicycle boulevards have speed bumps, some have traffic circles, some go do not enter after 3 or 4 blocks. Basically just a marginal annoyance to try and get non-local drivers onto other roads.