ORINDA -- Motorists in the third bore of the Caldecott Tunnel will see new traffic lights turn on about 10:30 a.m. Tuesday. They will stay green for 10 days during a test.

Caltrans advises motorists not be alarmed by the tests of the 10 new inner-tunnel traffic signals, a safety feature to go into service later this year.

When fully activated, the lights will be able to turn yellow or red in response to accidents, stalls, or other traffic delays inside the third bore, said Caltrans spokeswoman Ivy Morrison. Otherwise, the lights will stay green.

"We're only going to test the green because it would confuse motorists to test the red and yellow," she said.

May 2013: Contractors pave the lanes inside the Caldecott Tunnel fourth bore. (Karl Mondon/Bay Area News Group)
May 2013: Contractors pave the lanes inside the Caldecott Tunnel fourth bore. (Karl Mondon/Bay Area News Group)

The new LED lights will be appear brighter than normal because they are located in a tunnel rather than open daylight, she added.

Similar traffic lights also were built inside the Caldecott Tunnel's fourth bore, which is expected to open later this year.

Contact Denis Cuff at 925-943-8267. Follow him at Twitter.com/deniscuff



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