A Redwood Valley woman was injured yesterday morning in a single-vehicle crash on Highway 20 east of Lucerne. According to the California Highway patrol’s Clear Lake Area office, Kristen Jahn was driving westbound at approximately 35 miles per hour when her vehicle went off the roadway and onto the north shoulder. Her car then hit a speed limit sign before crashing into a dirt embankment and rolling over. The car ended up on its wheels facing eastbound. Northshore Fire and CHP responded. Jahn was transported to Lucerne Alpine Park where REACH 6 picked her up and flew her to Santa Rosa Memorial Hospital.