There is a now a petition to close the road where four high school students were killed recently in west Marin County. There is a growing memorial on San Geronimo Valley Road in west Marin County that is still visited by mourners, more than a week after a violent crash that killed four teens and sent two others to the hospital. The curvy county road is an old highway and one of the only ways in to Woodacre, an unincorporated town of just about 1…