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Evening traffic streaks through the Caldecott Tunnel in Oakland, Calif., Wednesday, July 9, 2014. (D. Ross Cameron/Bay Area News Group)

OAKLAND -- Motorists traveling east through the Caldecott Tunnel over the next two weekends will get a temporary taste of the traffic delays they endured before the $417 million fourth bore opened last November.

Caltrans announced plans to close the second bore overnight on two consecutive weekends -- six nights and six mornings -- for a lane realignment and repaving of the approach to the bore.

The biggest traffic disruption could occur during Monday morning commutes, when the closures are scheduled to extend until 7 a.m. on Aug. 11 and 18. Motorists should be prepared for delays from 5 to 20 minutes while the eastbound traffic from Oakland to Orinda is limited to a single bore, Caltrans spokeswoman Ivy Morrison said.

"We're asking people to be patient and prepared for delays up to 20 minutes," Morrison said.

The Caldecott Tunnel on Highway 24 has four bores, two eastbound and two westbound.

The second -ore closures are set to be from 8 p.m. Friday to noon Saturday; from 8 p.m. Saturday to noon Sunday; and from 8 p.m. Sunday to 7 a.m. Aug. 11.

If a second weekend is needed to complete the work, the second bore also will be closed from 8 p.m. Aug. 15 to noon Aug. 16; from 8 p.m. Aug. 16 to noon Aug. 17; and from 8 p.m. Aug. 17 to 7 a.m. Aug. 18.

Westbound traffic will not be affected.

Realigning and regrading the lane approach to the second bore will provide a smoother ride for motorists, Morrison said. The work is one of the final elements of the fourth bore construction project that improved flows in the off-peak direction.


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Traffic direction in the second bore used to change during the day, but that bore was converted to eastbound-only traffic permanently after the fourth bore opened last year.

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