For the first time in almost 50 years, California is building highway tunnels -- two single-lane, 4,200-foot-long tunnels through San Pedro Mountain on the Pacific Coast in San Mateo County. Excavation for the Devil's Slide tunnels began in 2007 and was extensive. The tunnels, estimated to cost $439 million, are completed except for the operating systems inside them, so the opening date was pushed back to early 2013, according to Caltrans spokesman Bob Haus.

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