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Phil McKenna says a new system in San Francisco learns from the past to predict traffic jams before they happen.

It’s the bane of drivers the world over. You round a corner on a busy highway to find the traffic in front of you at a standstill, blocking the road ahead as far as the eye can see. What should have been a quick commute has just turned into a frustrating slog.  For a few lucky drivers in San Francisco, this should be a thing of the past. They are now able to peer into the future and receive warnings of traffic jams before they occur, allowing them to change their route or timing.