A system for use with a motor vehicle that minimizes injury after a loss of control event. An electret capacitor type composite sensor is constituted by a casing 11, an electrode 12, a hole portion 22, a spacer 31, a vibration plate 41 having light transmissibility, a vibration plate ring 42, a printed board 6 and a semiconductor element 61. A valve extends from the first end of the housing for dispensing medical grade air to a patient. In addition, provided is a process for producing L-proline-4-hydroxylase using the transformant which contains the gene and has a reinforced proline biosynthesis activity.