WisDOT_DTSD_BTO_STOC_Roadway Equip - 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: Field Barrier System Control
Field elements that control barrier systems such as gates and other systems that manage entry to roadways, transportation facilities and infrastructure.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall activate barrier systems for transportation facilities and infrastructure under center control. Barrier systems include automated or remotely controlled gates, barriers and other systems that manage entry to roadways. | Existing |
Functional Area: Roadway Basic Surveillance
Field elements that monitor traffic conditions using loop detectors and CCTV cameras.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall collect, process, digitize, and send traffic sensor data (speed, volume, and occupancy) to the center for further analysis and storage, under center control. | Existing |
| 2 | The field element shall collect, process, and send traffic images to the center for further analysis and distribution. | Existing |
| 3 | The field element shall collect, digitize, and send multimodal crossing and high occupancy vehicle (HOV) lane sensor data to the center for further analysis and storage. | Existing |
| 4 | The field element shall return sensor and CCTV system operational status to the controlling center. | Existing |
Functional Area: Roadway Data Collection
Field elements to collect traffic, road, and environmental conditions information for use in transportation planning, research, and other off-line applications. Includes the sensors, supporting roadside infrastructure, and communications equipment.
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 |
|---|---|---|
| 2 | The field element shall include sensors that receive configuration data from other field element devices, without center control. | Existing |
Functional Area: Roadway HOV Control
HOV lane usage traffic sensors and display equipment to notify users of HOV lane status for control of traffic in HOV lanes on freeways.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall include sensors to detect high-occupancy vehicle (HOV) lane usage, under center control. | Existing |
| 3 | The field element shall include freeway control devices, such as ramp signals and mainline metering and other systems associated with freeway operations that control use of HOV lanes, under center control. | Existing |
| 5 | The field element shall provide traffic flow measures and information regarding vehicle occupancy (i.e., lane usage) in HOV lanes to the center. | Existing |
Functional Area: Roadway Incident Detection
Field elements that monitor traffic conditions to identify incidents. It includes traffic detectors that collect traffic flow information and identify unusual traffic conditions and advanced CCTV cameras with built-in incident detection algorithms.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall collect, process, and send traffic images to the center for further analysis and distribution. | Existing |
| 2 | The field element shall remotely process video data and provide an indication of potential incidents to the traffic management center. | Existing |
| 3 | The field element's video devices shall be remotely controlled by a traffic management center. | Existing |
Functional Area: Roadway Intersection Safety Warning
Field elements that determine the probability of a collision in an intersection or at a railroad crossing and inform approaching vehicles using short-range wireless communications to the vehicles and traffic signal controls.
Functional Area: Roadway Probe Data Communications
Field elements that collect probe data from vehicles using short range communications.
Functional Area: Roadway Reversible Lanes
Traffic sensors, surveillance, and automated reversible lane equipment and lane control signals to control traffic in reversible lanes.
| ID | Requirement | Status |
|---|---|---|
| 2 | The field element shall include automated reversible lane equipment and driver information systems (such as lane control signals) that control traffic in reversible lanes on surface streets, under center control. | Planned |
Functional Area: Roadway Signal Priority
Field elements that provide the capability to receive transit vehicle signal priority requests and control traffic signals accordingly.
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 |
| 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 |
Functional Area: Roadway Traffic Information Dissemination
Driver information systems, such as dynamic message signs and Highway Advisory Radio (HAR).
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall include dynamic messages signs for dissemination of traffic and other information to drivers, under center control; the DMS may be either those that display variable text messages, or those that have fixed format display(s) (e.g. vehicle restrictions, or lane open/close). | Existing |
| 2 | The field element shall include driver information systems that communicate directly from a center to the vehicle radio (such as Highway Advisory Radios) for dissemination of traffic and other information to drivers, under center control. | Existing |
| 4 | The field element shall provide operational status for the driver information systems equipment (DMS, HAR, etc.) to the center. | Planned |
| 5 | The field element shall provide fault data for the driver information systems equipment (DMS, HAR, etc.) to the center for repair. | Planned |
Functional Area: Roadway Traffic Metering
Control equipment including ramp, interchange, and mainline meters and the dynamic message signs that provide information about the meters and any special bypass lanes.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall regulate the flow of traffic on ramps, interchanges, and the mainline, under center control. | Existing |
| 3 | The field element shall return ramp, interchange, and mainline meter operational status to the controlling center. | Existing |