Fresno Area Environmental Detection System - Roadway Functionality
Subsystem Description
The Roadway Subsystem (RS) includes the equipment distributed on and along the roadway that monitors and controls traffic and monitors and manages the roadway itself. Equipment includes traffic detectors, environmental sensors, traffic signals, highway advisory radios, dynamic message signs, CCTV cameras and video image processing systems, grade crossing warning systems, and freeway ramp metering systems. HOV lane management, reversible lane management functions, and barrier systems that control access to transportation infrastructure such as roadways, bridges and tunnels are also supported. This subsystem also provides the capability for environmental monitoring including sensors that measure road conditions, surface weather, and vehicle emissions. In adverse conditions, automated systems can be used to apply anti-icing materials, disperse fog, etc. Work zone systems including work zone surveillance, traffic control, driver warning, and work crew safety systems are also included. To enhance security, safeguard systems such as blast shields, exhaust systems and other automated and remotely controlled systems to protect transportation infrastructure is also provided. In advanced implementations, this subsystem supports automated vehicle safety systems by safely controlling access to and egress from an Automated Highway System through monitoring of, and communications with, AHS vehicles. Intersection collision avoidance functions are provided by determining the probability of a collision in the intersection and sending appropriate warnings and/or control actions to the approaching vehicles.
Functional Area: Roadway Emissions Monitoring
Emissions and air quality sensors that collect vehicular emissions and area-wide air quality data.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall include emissions sensors that detect levels of emissions from individual vehicles, under center control. | Planned |
| 2 | The field element shall include air quality sensors, often distributed geographically, that detect area-wide levels of pollution, under center control. | Planned |
| 3 | The field element shall analyze collected vehicle emissions data against reference data to determine whether or not a vehicle is violating the acceptable levels of emissions, and shall return this analysis to a center for possible enforcement action. | Planned |
| 4 | If the emissions level detected by the emissions sensor indicates a vehicle is violating the acceptable levels of emissions, the field element shall provide the capability to display summary emissions information or warnings to passing drivers via a driver information system (such as portable messages signs, field to vehicle communications to in-vehicle signing systems, etc.). | Planned |
| 5 | The field element shall provide emissions sensor equipment operational status to the center. | Planned |
| 6 | The field element shall provide emissions sensor equipment fault indication to the center for repair. | Planned |
| 7 | The field element shall provide area-wide pollution sensor equipment operational status to the center. | Planned |
| 8 | The field element shall provide area-wide pollution sensor equipment fault indication to the center for repair. | Planned |
Functional Area: Roadway Equipment Coordination
Field elements that control and send data to other field elements (such as environmental sensors that send data to a DMS or coordination between traffic controllers on adjacent intersections), without center control.