Caltrans has big plans next month for drivers going through the Rohnert Park-Cotati construction zone on Highway 101.

Spokesman Robert Haus said the exact dates aren’t pinned down but:

–At Railroad Avenue in Cotati, southbound 101 traffic will be shifted to the right onto a new overpass, while northbound will be shifted left to the current southbound lanes. That’ll allow crews to demolish and rebuild the northbound overpass.

–At Highway 116, northbound 101 traffic will be shifted to the right onto an overpass now being finished, while southbound 101 traffic will be moved left onto the current northbound lanes. That’ll allow crews to demolish and rebuild the southbound overpass.

–Work will begin on the next stretch of the 101 widening, from Pepper Road south to Petaluma Boulevard North.

–In July in Rohnert Park, northbound 101 will be shifted to the right onto a new Commerce Boulevard/Wilfred Avenue overpass and southbound 101 will be moved over later. This will allow crews to start a new southbound overpass.

–Before the Commerce/Wilfred overpass opens, Haus said, the new southbound Wilfred Avenue exit at Santa Rosa Avenue will be opened.