Maintenance Area Access The BorderTransportationSystem will have many areas that will require scheduled maintenance or inspections, and thus will need secure access to these areas.  The 'T' towers and the Wind Turbine towers can be secured with biometric sensors that will only allow certified workers into the areas.  The access areas can and should also be monitored with motion sensing cameras so that if a person not authorized tries to enter, he or she will be detected.  Recommended is a Camera that contains the following:  Smoke Detection, Failure Detection, Motion Detection, Infrared Detection, Sound Detection.  Index of ... Biometric Sensors and Detectors Motion Activated Spy Cameras NewEgg - Sound and Motion Detector Cameras