| 摘要 |
A point-of-entry security system for ground-based mass transit vehicles is disclosed. The invention employs an electromagnetic field generator attached to, or incorporated within, the doorframe or entranceway of said vehicle for sensing or detecting metallic objects being carried by passengers attempting to board the vehicle. The security system is designed to audibly and/or visibly alert the operator of said vehicle of a security breach. An optional wireless sending unit may be employed to transmit system data or security alerts to remote security personnel or to remote locations.
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