County and City Roadside ITS Equipment - 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 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 |
| 4 | The field element shall return sensor and CCTV system operational status to the controlling center. | Existing |
Functional Area: Roadway Signal Controls
Field elements including traffic signal controllers for use at signalized intersections; also supports pedestrian crossings.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall control traffic signals under center control. | Existing |
| 2 | The field element shall respond to pedestrian crossing requests by accommodating the pedestrian crossing. | Existing |
| 4 | The field element shall report the current signal control information to the center. | Existing |
| 6 | The field element shall return traffic signal controller operational status to the center. | Existing |
Functional Area: Roadway Signal Preemption
Field elements that receive signal preemption requests from approaching emergency vehicles and overrides the current operation of the traffic signals
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall respond to signal preemption requests from emergency vehicles. | Existing |
Functional Area: Roadway Signal Priority
Field elements that provide the capability to receive transit vehicle signal priority requests and control traffic signals accordingly.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall respond to signal priority requests from transit vehicles. | 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 |
| 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 |
| 4 | The field element shall provide operational status for the driver information systems equipment (DMS, HAR, etc.) to the center. | Existing |
Functional Area: Roadway Work Zone Traffic Control
Field elements in maintenance and construction areas including CCTV cameras, driver information systems (such as DMS), and gates/barriers that monitor and control traffic and provide information directly to drivers in affected areas.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall collect, process, and send work zone images to the center for further analysis and distribution, under center control. | Existing |
| 3 | Under the control of field personnel within maintenance vehicles, the field element shall include driver information systems (such as dynamic messages signs and highway advisory radios) that advise drivers of activity around a work zone through which they are currently passing. | Existing |
| 5 | The field element shall provide operational status for the surveillance (e.g. CCTV), driver information systems, and gates/barriers in work zones to the maintenance center. | Existing |