in the latest ambitious and costly assault on gridlock, Los Angeles has synchronized every one of its 4,500 traffic signals across 469 square miles — the first major metropolis in the world to do so, officials said..
Without synchronization, it takes an average of 20 minutes to drive five miles on Los Angeles streets; with synchronization, it has fallen to 17.2 minutes, the city says. And the average speed on the city’s streets is now 17.3 miles per hour, up from 15 m.p.h. without synchronized lights.
with synchronization, it takes me 20-25 mins to bike 5.5 miles from downtown berkeley to downtown oakland. (the lights go green on telegraph ave. toward oakland, and i bike moderately fast).
and yes, the bad part about synchronization is that drivers will drive faster because they no longer have to stop at reds.