School Buses - Transit Vehicle Subsystem Functionality
Subsystem Description
This subsystem resides in a transit vehicle and provides the sensory, processing, storage, and communications functions necessary to support safe and efficient movement of passengers. The types of transit vehicles containing this subsystem include buses, paratransit vehicles, light rail vehicles, other vehicles designed to carry passengers, and supervisory vehicles. The subsystem collects accurate ridership levels and supports electronic fare collection. The subsystem supports a traffic signal prioritization function that communicates with the roadside subsystem to improve on-schedule performance. Automated vehicle location functions enhance the information available to the Transit Management Subsystem enabling more efficient operations. On-board sensors support transit vehicle maintenance. The subsystem supports on-board security and safety monitoring. This monitoring includes transit user or vehicle operator activated alarms (silent or audible), as well as surveillance and sensor equipment. The surveillance equipment includes video (e.g. CCTV cameras), audio systems and/or event recorder systems. The sensor equipment includes threat sensors (e.g. chemical agent, toxic industrial chemical, biological, explosives, and radiological sensors) and object detection sensors (e.g. metal detectors). In addition, the subsystem supports vehicle operator authentication prior to operation of the vehicle and remote vehicle disabling. The subsystem also furnishes travelers with real-time travel information, continuously updated schedules, transfer options, routes, and fares.
Functional Area: On-board Schedule Management
Collecting of data for schedule generation and adjustment on-board a transit vehicle. Supports communication between the vehicle, operator, and center.
| ID | Requirement | Status |
|---|---|---|
| 1 | The transit vehicle shall receive a vehicle assignment including transit route information, transit service instructions, traffic information, road conditions, and other information for the operator. | Planned |
| 2 | The transit vehicle shall use the route information and its current location to determine the deviation from the predetermined schedule. | Planned |
| 3 | The transit vehicle shall calculate the estimated times of arrival (ETA) at transit stops. | Planned |
| 4 | The transit vehicle shall determine scenarios to correct the schedule deviation. | Planned |
| 5 | The transit vehicle shall provide the schedule deviations and instructions for schedule corrections to the transit vehicle operator if the deviation is small, or the transit vehicle is operating in an urban area. | Planned |
| 6 | The transit vehicle shall send the schedule deviation and estimated arrival time information to the center. | Planned |
| 7 | The transit vehicle shall support the operations of a flexible route service. This may include requests for route deviations that would then lead to schedule corrective actions. | Planned |
| 8 | The transit vehicle shall notify the transit center of vehicle location and operational status as the vehicle exits and returns to the transit facility to support future vehicle assignments. | Planned |
Functional Area: On-board Transit Trip Monitoring
Support fleet management with automatic vehicle location (AVL) and automated mileage and fuel reporting and auditing.
| ID | Requirement | Status |
|---|---|---|
| 1 | The transit vehicle shall track the current location of the transit vehicle. | Planned |
| 2 | The transit vehicle shall support the computation of the location of a transit vehicle using on-board sensors to augment the location determination function. This may include proximity to the transit stops or other known reference points as well as recording trip length. | Planned |
| 3 | The transit vehicle shall record transit trip monitoring data including vehicle mileage and fuel usage. | Planned |
| 4 | The transit vehicle shall record transit trip monitoring data including operational status information such as doors open/closed, running times, etc. | Planned |
| 5 | The transit vehicle shall send the transit vehicle trip monitoring data to center-based trip monitoring functions. | Planned |