It has widened highways and added car pool, toll and bus-only lanes. But the roads have remained stubbornly clogged, creating a drag on commerce and the quality of life that has persisted here for generations.
Now, 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 — raising the almost fantastical prospect, in theory, of driving Western Avenue from the Hollywood Hills to the San Pedro waterfront without stopping once.
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