The following Functional Areas are associated with the "Caltrans Field Equipment" element.   Each functional area includes a brief description and a bulleted list of detailed functions.   The common icon provides a link to other systems in the region that include the same functional area.

 

Roadway Basic Surveillance

Field elements that monitor traffic conditions using loop detectors and CCTV cameras.

• 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.
• The field element shall collect, process, and send traffic images to the center for further analysis and distribution.
• The field element shall collect, digitize, and send pedestrian sensor data to the center for further analysis and storage.
• The field element shall collect, process, and send pedestrian images to the center for further analysis and distribution.
• 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.
• The field element shall return sensor and CCTV system operational status to the controlling center.
• The field element shall return sensor and CCTV system fault data to the controlling center for repair.

Roadway Environmental Monitoring

Environmental sensors, surface and sub-surface, that collect weather and road surface information. Weather conditions measured include temperature, wind, humidity, precipitation, and visibility. Sensors measure road surface temperature, moisture, icing,

• The field element shall include surface and sub-surface environmental sensors that measure road surface temperature, moisture, icing, salinity, and other measures.
• The field element shall include environmental sensors that measure weather conditions including temperature, wind, humidity, precipitation, and visibility.
• The field element's environmental sensors shall be remotely controlled by a maintenance center.
• The field element's environmental sensors shall be remotely controlled by a traffic management center.
• The field element's environmental sensors shall be remotely controlled by weather service providers such as the National Weather Service or value-added sector specific meteorological services.
• The field element shall provide environmental sensor equipment operational status to the controlling center or maintenance vehicle.
• The field element shall provide environmental sensor equipment fault indication to the controlling center or maintenance vehicle.
• The field element shall provide weather and road surface condition data to centers.

Roadway Freeway Control (User Defined)

Ramp meters, dynamic message signs, and other freeway control equipment which controls traffic on freeways.

• The field element shall include ramp metering controllers for use on freeways, under center control.
• The field element shall monitor operation of ramp meter indicators and report to the center any instances in which the indicator response does not match that expected from the indicator control information.
• The field element shall monitor operation of ramp meter indicators and report to the center any instances in which the indicator response does not match that expected from known indicator preemptions.
• The field element shall return ramp metering controller operational status to the controlling center.
• The field element shall return ramp metering controller fault data to the maintenance center for repair.
• The field element shall provide indications to the driver via dynamic message signs informing the driver that a freeway ramp is available for use, and possible lane usage data for the freeway they are entering.

Roadway Incident Detection

Field elements that provide video images of traffic conditions, including advanced CCTV cameras with built-in incident detection algorithms.

• The field element shall collect, process, and send traffic images to the center for further analysis and distribution.
• The field element shall remotely process video data and provide an indication of potential incidents to the traffic management center.
• The field element's video devices shall be remotely controlled by a traffic management center.
• The field element shall provide operational status and fault data for the incident detection devices to the traffic management center.

Roadway Traffic Information Dissemination

Driver information systems, such as dynamic message signs and Highway Advisory Radio (HAR).

• 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.
• The field element shall include pedestrian information systems under center control (e.g. warning pedestrians of a potential hazard, or providing mandatory instructions as to the availability of pedestrian access).
• The field element shall provide operational status for the driver information systems equipment (DMS, HAR, etc.) to the center.
• The field element shall provide fault data for the driver information systems equipment (DMS, HAR, etc.) to the center for repair.
• The field element shall include dynamic messages signs for dissemination of traffic and other information to drivers, under center control.

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.

• The field element shall include sensors (such as traffic, environmental, and work zone intrusion detection sensors) that provide data and status information to other field element devices (such as dynamic message signs, ramp meters, traffic signals, work zone intrusion alert systems), without center control.
• The field element shall include sensors (such as traffic, environmental, and work zone intrusion detection sensors) that receive control information from other field element devices, without center control.
• The field element shall include devices (such as arterial or freeway controllers, roadway automated treatment systems, barrier and safeguard systems, emissions or pollution systems, and work zone intrusion alert systems) that provide data and status information to other field element devices (such as dynamic message signs, traffic controllers on adjacent intersections), without center control.
• The field element shall include devices (such as arterial or freeway controllers, roadway automated treatment systems, barrier and safeguard systems, emissions or pollution systems, and work zone intrusion alert systems) that receive control information from other field element devices, without center control.

Roadway Work Zone Traffic Control

Field elements in a work zone that manage traffic conditions using CCTV cameras and driver information systems (such as DMS) to provide information directly to drivers affected by the work zone activity.

• The field element shall collect, process, and send work zone images to the center for further analysis and distribution, under center control.
• 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.
• The field element shall provide operational status for the surveillance (e.g. CCTV) and driver information systems in work zones to the maintenance center.
• The field element shall provide fault data for the surveillance (e.g. CCTV) and driver information systems in work zones to the maintenance center for repair.

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.

• The field element shall return barrier system operational status to the controlling center.
• The field element shall return barrier system fault data to the maintenance center for repair.
• The field element shall activate barrier systems for transportation facilities and infrastructure under center control.

Field Safeguard System Control

Field elements that control safeguard systems such as blast shields and tunnel exhaust systems that are used to mitigate the impact of incidents on transportation infrastructure.

• The field element shall activate safeguard systems, equipment used to mitigate the impact of incidents on transportation infrastructure (e.g., blast shields, tunnel exhaust systems, etc.) under center control.
• The field element shall return safeguard system operational status to the controlling center.
• The field element shall return safeguard system fault data to the maintenance center for repair.