A multiple car injury accident Ridge Road and Sierra College Blvd is causing traffic issues in the area. Four cars are involved with three injuries- emergency crews are on scene. Please avoid the area of Ridge Road and Sierra College if you need to get to Nevada Union High School please access from the Nevada City Highway side of Ridge Road. One transported by air ambulance two others by ground ambulance. . Please avoid the area of Hughes Road and Sierra College Blvd. Multiple car injury accident.