Caltrans plans to open up Nov. 30 the extra north and southbound lanes on Highway 101 from Rohnert Park Expressway south to Petaluma Boulevard North, making 101 three lanes in each direction.

The highway will remain only two lanes in each direction from Rohnert Park Expressway north to Santa Rosa Avenue, and that stretch is not expected to be widened until late 2012 because crews need to finish building the new Commerce Boulevard-Wilfred Avenue overpass. So there will be traffic bottleneck at times north and southbound there.

The formal announcement of the opening of the lanes, designated as car pool lanes, was due Thursday but Caltrans postponed it.

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