By Liz Kellar | Staff Writer Authorities are still searching for a 23-year-old woman who they say hit a motorcyclist head-on Saturday and fled the scene. Brienne Amber Rousseau was identified by witnesses and evidence at the scene, said California Highway Patrol Officer Mike Steele. Rousseau was driving an Infiniti G35 southbound on Lower Colfax Road, near Laws Ranch Road, at just after noon when she hit a northbound BMW motorcycle, Steele said. “She was driving on the wrong side of the road,” he said. The motorcyclist, a 51-year-old man from Roseville, was ejected and sustained major but non-life-threatening injuries, Steele said. He was flown to Sutter Roseville Medical Center.