City of Lawrence Traffic Field 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. | Medium-term |
| 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 |
| 5 | The field element shall return sensor and CCTV system fault data to the controlling center for repair. | Existing |
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 |
| 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. | Medium-term |
Functional Area: Roadway Mixed Use Sensing
Provides the field devices that provide sensing and warning systems for pedestrians, bicyclists, and other vehicles that operate on the main vehicle roadways, or on pathways which intersect the main vehicle roadways.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall collect images or sensor data for pedestrians or bicyclists and respond to pedestrian or bicyclist crossing requests via display, audio signal, or other manner. | Long-term |
| 2 | The field element shall provide the capability to notify the traffic management center that a pedestrian or bicyclist has requested right-of-way and when the request was or will be granted. | Long-term |
Functional Area: Roadway Warning
Field elements used to warn drivers approaching hazards including adverse road weather conditions, traffic conditions including queues, and obstacles or animals in the road.
| ID | Requirement | Status |
|---|---|---|
| 1 | The field element shall monitor for hazardous traffic conditions, including queues. | Medium-term |
| 2 | The field element shall monitor for hazardous road surface and local weather conditions. | Medium-term |
| 3 | The field element shall monitor for debris, animals, or other objects in the travel lanes. | Medium-term |
| 5 | The field element shall autonomously identify potentially hazardous conditions and activate warning signs to approaching motorists. | Medium-term |
| 7 | The field element shall collect operational status of the warning system field equipment and report the operational status to the controlling center. | Medium-term |
| 8 | The field element shall monitor and report faults to the controlling center. | Medium-term |
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. | Medium-term |
| 2 | Under traffic and maintenance center control, the field element shall include driver information systems (such as dynamic messages signs and highway advisory radios) that advise drivers of activity around the work zone through which they are currently passing. | Medium-term |
| 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. | Medium-term |
| 6 | The field element shall provide fault data for the surveillance (e.g. CCTV), driver information systems, and gates/barriers in work zones to the maintenance center for repair. | Medium-term |