If you’re tired of the uneven pavement on Highway 101 between Rohnert Park and Petaluma, there’s light at the end of the tunnel.

Caltrans spokesman Robert Haus says the final paving project is set to start June 4 and will take about four to six weeks to complete.

That’s weather permitting. A streak of rain or unusually cold weather could pushed that back a bit.

As for the last segments of the Wilfred Avenue and Commerce Boulevard overpasses in Rohnert Park, he said those should open later this year. That will get rid of the current four-lane stretch from Santa Rosa Avenue to Rohnert Park Expressway, making Highway 101 six lanes from about Petaluma Boulevard North to downtown Windsor.

Haus said Caltrans likely will open up the carpool lanes in the Rohnert Park stretch and then do the final paving work whenever it can, perhaps by late this year or early 2013.

And for those wondering why Caltrans had to twice cancel overnight concrete work on 101 between Healdsburg and Windsor, Haus said the concrete sample the contractor had submitted for approval didn’t meet Caltrans’ standards both times.

He said the sample showed that the concrete wouldn’t have hardened in time for Caltrans to allow morning commuters to drive over the new patches.

That project was due to be completed Monday morning.

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