Huron Speed Warning 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 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.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall include sensors that provide data and status information to other field element devices, without center control. | Existing |
| 2 | The field element shall include sensors that receive configuration data from other field element devices, without center control. | Existing |
| 3 | The field element shall include devices that provide data and status information to other field element devices without center control. | Existing |
| 4 | The field element shall include devices that receive configuration data from other field element devices, without center control. | Existing |
Functional Area: Roadway Speed Monitoring and Warning
Vehicle speed sensors that detect excessive vehicle speeds, optionally based on conditions and vehicle type, informing drivers, centers and/or enforcement agencies of speed violations.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall include sensors to detect vehicle speeds, under traffic or maintenance center control. | Existing |
| 2 | The field element shall include sensors to detect vehicle speeds, under enforcement agency control. | Existing |
| 3 | If the speed detected by vehicle speed sensors is determined to be excessive, the field element shall provide a safe speed advisory to passing drivers via a driver information system (such as portable messages signs, field to vehicle communications to in-vehicle signing systems, etc.). | Existing |
| 4 | The field element shall base speed advisories to passing drivers on environmental conditions. | Existing |
| 5 | The field element shall monitor notify an enforcement agency when a speed violation is detected. | Existing |
| 6 | The field element shall return operational status for the vehicle speed sensors to the controlling traffic or maintenance center; including measured speeds, warning messages displayed, and violation records. | Existing |
| 7 | The field element shall return operational status for the vehicle speed sensors to the enforcement agency. | Existing |
| 8 | The field element shall return fault data for the vehicle speed sensors to the controlling center for repair. | Existing |