This center-to-field application area covers the interface between a traffic management center and ramp metering equipment in the field. The ramp meter control (RMC) unit meters freeway entry lanes in order to restrict the flow of traffic onto the freeway. The RMC has a metering plan that is either locally stored or can be loaded from the traffic management center. The metering plan can be adjusted manually or automatically based upon traffic sensor data gathered from the mainline or metered lanes.
National ITS Architecture Interface
This application area includes the interface between the Traffic Management Subsystem (TMS) and the ramp metering equipment and traffic sensor equipment in the Roadway Subsystem (RS). The TMS remotely controls the ramp metering and traffic sensor equipment by sending initialization, control and operating parameters, as well as requests for equipment status and condition to the RS. The field equipment responds with the current operating status information (including fault information) and control settings, when requested.
Applicable Standards
In general, the following standards are applicable to Ramp Metering deployments.
To determine which specific standards are applicable for a deployment you will
need to determine which architecture flows will be needed for the Ramp Metering piece of your deployment.
Contact your local FHWA
ITS division specialist or an
ITS Standards Program Field Support Team contact for additional help.
Standards development statuses as of October 2, 2008
