A passenger protection system includes acceleration sensors as well as a
passenger protection ECU. At least one acceleration sensor is provided on
one of the width-direction sides of the vehicle and at least one
accelerator sensor is provided on the other width-direction side of the
vehicle. Based on signals generated by the acceleration sensors the
passenger protection ECU determines occurrence of a collision, and drives
passenger protection apparatus accordingly. In the event of a collision,
the passenger protection ECU performs an AND operation on a signal from
the acceleration sensor on the colliding one of the width-direction sides
of the vehicle, and a signal from the acceleration sensor on the other
width-direction side not experiencing the collision, to drive the
passenger protection apparatus.