Tuolumne Rd. Head-On Collision Sponsored by: By B.J. Hansen Published May 29, 2009 03:50 pm Updated May 29, 2009 03:52 pm Sonora, CA – An ambulance is responding to a head-on collision on Tuolumne Rd. just east of the Junction Shopping Center. Travel with caution in that area as of 3:50pm.