This was in spite of 4 cops directing the traffic.
I don't understand why it was backed up. Cops directing traffic should be more effective/efficient than traffic lights, not horribly less efficient.
In Dublin (Ireland), it has been my experience that when they put cops out directing traffic at junctions, traffic moves way better than on an average day with the lights working.
I don't understand what is different here. This is not the first time I've found cops directing traffic to be horribly inefficient in the SF Bay Area. Is it because they're not trained well? Because they don't care? Because the drivers are so clueless that they can't deal with directions from a police officer?