System for securing interest points of joint transport network in e.g. such residential building, has alarm unit arranged near access road at interest point to alert users of access road and presence of users near interest point

摘要

The system (10) has a detecting unit (24) for detecting presence of users (20) proximate to an interest point (14). An alarm unit (26) is arranged near an access road (16) at the interest point to alert the users of the access road and presence of the users near the interest point. The detecting unit of the interest point controls the activation of the alarm unit in the event of detecting more than one user in the interest point. The detecting unit comprises a radio frequency unit (321) and an infra-red unit (322).