Mike Rosenberg, reporting for the San Jose Mercury News:
A groundbreaking study by UC Berkeley and MIT researchers has pinpointed a small group of drivers making Bay Area freeways miserable for the rest of us, though the reason may surprise you. These commuters aren’t necessarily slow or bad drivers. Instead, they come from a few outlying neighborhoods and travel long distances together in the same direction like schools of fish—clogging up not only the roads they drive on, but also everyone else’s.