Interface Definition

environmental conditions   (Planned)  

Current environment conditions (e.g., air temperature, wind speed, surface temperature) as measured by environmental sensors and communicated by supporting field equipment.

 

fault reports   (Planned)  

Reports from field equipment (sensors, signals, signs, controllers, etc.) which indicate current operational status.

 

freeway control data   (Planned)  

Control commands and operating parameters for ramp meters, dynamic message signs, mainline metering/lane controls and other systems associated with freeway operations.

 

freeway control status   (Planned)  

Current operational status and operating parameters for ramp meters, dynamic message signs, mainline metering/lane controls and other control equipment associated with freeway operations.

 

hov data   (Planned)  

Current HOV lane information including both standard traffic flow measures and information regarding vehicle occupancy in HOV lanes.

 

hri control data   (Planned)  

Data required for HRI information transmitted at railroad grade crossings and within railroad operations.

 

hri request   (Planned)  

A request for highway-rail intersection status or a specific control request intended to modify HRI operation.

 

hri status   (Planned)  

Status of the highway-rail intersection equipment including both the current state or mode of operation and the current equipment condition.

 

request for right-of-way   (Planned)  

Forwarded request from signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other source for right-of-way.

 

roadway information system data   (Planned)  

Information used to initialize, configure, and control roadside systems that provide driver information (e.g., dynamic message signs, highway advisory radio, beacon systems). This flow can provide message content and delivery attributes, local message store maintenance requests, control mode commands, status queries, and all other commands and associated parameters that support remote management of these systems.

 

roadway information system status   (Planned)  

Current operating status of dynamic message signs, highway advisory radios, beacon systems, or other configurable field equipment that provides dynamic information to the driver.

 

sensor and surveillance control   (Planned)  

Information used to configure and control sensor and surveillance systems at the roadside.

 

signal control data   (Planned)  

Information used to configure and control traffic signal systems.

 

signal control status   (Planned)  

Status of surface street signal controls.

 

traffic flow   (Planned)  

Raw and/or processed traffic detector information which allows derivation of traffic flow variables (e.g., speed, volume and density measures).

 

traffic images   (Planned)  

High fidelity, real-time traffic images suitable for surveillance monitoring by the operator or for use in machine vision applications.

 

vehicle probe data   (Planned)  

Vehicle probe data indicating identity, route segment identity, link time and location.