5.1.7.3 - Provide Transit Vehicle Security DFD

The processes in this DFD make up the Provide Transit Vehicle Security facility within the Manage Transit function. As part of securing the transit vehicle, the processes collect surveillance data on-board the transit vehicle by use of video and audio equipment and collect sensor data from sensors on-board the transit vehicle. This data is then processed to determine if a threat exists, and sent on to other processes within Transit Management and Emergency Management to determine the correct response activity to take. In addition to the surveillance and sensor activities on-board the transit vehicle, the transit vehicle operator or the traveler can send a silent (or audible, in the case of the operator) alarm to the transit operations personnel indicating an emergency situation on-board the vehicle. The operator may also turn on a covert mike so that the center may listen in. In addition to these functions, the transit vehicle operator may initiate operator logon, which initiates the operator authentication process either on the vehicle or at the center. During an incident (e.g., a hijacking, a criminal act, or a terrorist act), the center may remotely disable the transit vehicle through processes in this DFD.

The key points about the facility are as follows:

Raw and preliminarily processed sensor and surveillance data to processes within the Manage Emergency Services function;
Sensor and surveillance data analyzed to detect threats;
Sensors and surveillance equipment monitored to detect and report any sensor faults;
Interface to travelers on-board a transit vehicle for reporting of emergencies and broadcast advisory messages to all travelers in the secure area (i.e., on-board the vehicle);
Transit Center may remotely disable a transit vehicle during an emergency;
Operator authentication is performed either on the vehicle or at the center; operator or traveler may initiate a silent (or audible) alarm.

There are six processes in this DFD:
(a) Surveil Secure Vehicle Area (5.1.7.3.1)
(b) Process Secure Vehicle Area Surveillance (5.1.7.3.2)
(c) Collect Secure Vehicle Area Sensor Data (5.1.7.3.3)
(d) Process Secure Vehicle Area Sensor Data (5.1.7.3.4)
(e) Manage Secure Vehicle Emergencies (5.1.7.3.5)
(f) Provide Transit Vehicle Operator Interface for Emergencies (5.1.7.3.6)

In secure areas on-board the vehicle, video and audio surveillance data are collected by process (a) and are output to process (b) for further processing in the field, and to other processes in the Manage Emergency Services facility for center analysis. Similarly, process (c) collects data from sensors such as threat sensors and object detection sensors, and outputs that raw data to process (d) for further processing in the field, and to other processes in the Manage Emergency Services facility for center analysis. Field-processed sensor and surveillance data, as well as any indication of potential incidents or threats based on preliminary field analysis, are output from (b) and (d) and sent to center processes for further correlation, verification, and dissemination to other functions. All surveillance and sensor status and faults collected by processes (a) and (c) are sent to other processes which then forward them to the Manage Maintenance and Construction facility for correction. Process (e) receives advisory information from another process in the Manage Emergency Services function for broadcast to all travelers in the secure area (i.e., on-board the transit vehicle). Process (e) also allows the traveler to declare an emergency and allows the Transit Management Center to remotely disable a transit vehicle during an emergency. Process (f) provides an interface to the transit vehicle operator for declaring emergencies and receives the request for the transit vehicle operator to be authenticated by either the Center or on-board the vehicle.

DFD: 5.1.7.3 - Provide Transit Vehicle Security

Parent DFD: 5.1.7 - Provide Traveler and Remote Area Security

PSpecs in this DFD: