ST MARY: ((5418816) CAD) 15:16:17*MVA SERIOUS*22939 THREE NOTCH RD INTERSECTN*SHADY MILE DR*CALIFORNIA*CO9 SQ3 SQ7 ALS ST38 ST39 M139* shady mile/three notch rd* Rescue Squad 7 and Truck 7 Responded to this MVA with subjects trapped. Crews assisted Bay District VFD with removing doors and roof. 3 patients were flown to trauma centers via Trooper 7. Truck 7 was on the air doing Drivers training when this run came in.