The invention relates to a security device for motor vehicles, comprising first sensor means (101), for determining the vehicle collision and for output of first sensor signals (102), a controller (501), for output of trigger signals (601-607) depending on the first sensor signals (102) and a retaining system (700), triggered depending on the first sensor signals (102), whereby second sensor signals (201) for determining obstacles in the vehicle vicinity and for output of second sensor signals (202) and third sensor means (301-305) for determining environmental influences on the second sensor means (201) are provided. The second sensor signals (202) given by the second sensor means (201) are used in the controller for a decision on triggering the retainer system (700) after an evaluation of the third sensor signals (401-405) given by the third sensor means (301-305).
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