Physical Object: ITS Roadway Equipment

Roadway Signal Control

Overview

'Roadway Signal Control' includes the field elements that monitor and control signalized intersections. It includes the traffic signal controllers, detectors, conflict monitors, signal heads, and other ancillary equipment that supports traffic signal control. It also includes field masters, and equipment that supports communications with a central monitoring and/or control system, as applicable. The communications link supports upload and download of signal timings and other parameters and reporting of current intersection status. It represents the field equipment used in all levels of traffic signal control from basic actuated systems that operate on fixed timing plans through adaptive systems. It also supports all signalized intersection configurations, including those that accommodate pedestrians. In advanced, future implementations, environmental data may be monitored and used to support dilemma zone processing and other aspects of signal control that are sensitive to local environmental conditions.

This functional object is included in the "ITS Roadway Equipment" physical object.

This functional object is included in the following service packages:

This functional object is mapped to the following Functional View PSpecs:

Requirements

# Requirement
01 The field element shall control traffic signals under center control.
01 The field element shall implement pre-preemption adjustments to signal timing when notified of preemption status changes at adjacent intersections.
02 The field element shall respond to pedestrian crossing requests by accommodating the pedestrian crossing.
03 The field element shall provide the capability to notify the traffic management center of pedestrian calls and pedestrian accommodations.
04 The field element shall report the current signal control information to the center.
05 The field element shall report current preemption status to the center.
06 The field element shall return traffic signal controller operational status to the center.
07 The field element shall return traffic signal controller fault data to the center.
08 The field element shall report current transit priority status to the center.
09 The field element shall report current intersection signal timing information to roadside equipment for transmission to connected vehicles.
10 The field element shall receive request for transit vehicle signal priority.
11 The field element shall receive request for commercial vehicle signal priority.
12 The field element shall report current commercial vehicle priority status to the center.
13 The field element shall provide to roadside equipment the intersection geometry and signal phase movement information including phase and timing information, alarm status, and priority/preempt status.
14 The field element shall provide data to the Connected Vehicle Roadside Equipment.
15 The field element shall receive requests for signal preemption.
16 The field element shall receive request for signal change from an emissions/environmental field device.
17 The field element shall report current emissions/environmental priority status to the center.
18 The field element shall report current maintenance and construction vehicle priority status to the center.
19 The field element shall receive requests for maintenance and construction vehicle signal priority.

Information Flows

Source Flow Destination
Commercial Vehicle OBE local signal priority request ITS Roadway Equipment
Connected Vehicle Roadside Equipment intersection infringement info ITS Roadway Equipment
Connected Vehicle Roadside Equipment intersection status monitoring ITS Roadway Equipment
Connected Vehicle Roadside Equipment signal preemption request ITS Roadway Equipment
Connected Vehicle Roadside Equipment signal priority service request ITS Roadway Equipment
Connected Vehicle Roadside Equipment signal service request ITS Roadway Equipment
ITS Roadway Equipment driver information Commercial Vehicle Driver
ITS Roadway Equipment conflict monitor status Connected Vehicle Roadside Equipment
ITS Roadway Equipment intersection control status Connected Vehicle Roadside Equipment
ITS Roadway Equipment driver information Driver
ITS Roadway Equipment driver information Emergency Personnel
ITS Roadway Equipment driver information Light Vehicle Driver
ITS Roadway Equipment driver information Maint and Constr Vehicle Operator
ITS Roadway Equipment crossing permission MMV User
ITS Roadway Equipment right-of-way request coordination Other ITS Roadway Equipment
ITS Roadway Equipment signal control coordination Other ITS Roadway Equipment
ITS Roadway Equipment crossing permission Pedestrian
ITS Roadway Equipment right-of-way request notification Traffic Management Center
ITS Roadway Equipment signal control status Traffic Management Center
ITS Roadway Equipment signal fault data Traffic Management Center
ITS Roadway Equipment driver information Transit Vehicle Operator
Maint and Constr Vehicle OBE local signal priority request ITS Roadway Equipment
MMV User crossing call ITS Roadway Equipment
Other ITS Roadway Equipment right-of-way request coordination ITS Roadway Equipment
Other ITS Roadway Equipment signal control coordination ITS Roadway Equipment
Other ITS Roadway Equipment traffic detector coordination ITS Roadway Equipment
Pedestrian crossing call ITS Roadway Equipment
Traffic Management Center signal control commands ITS Roadway Equipment
Traffic Management Center signal control device configuration ITS Roadway Equipment
Traffic Management Center signal control plans ITS Roadway Equipment
Traffic Management Center signal system configuration ITS Roadway Equipment
Transit Vehicle OBE local signal priority request ITS Roadway Equipment
Vehicle Characteristics vehicle characteristics ITS Roadway Equipment

Standards

The following table lists the standards associated with the functional object itself (as opposed to standards associated with an interface).

Name Title
ITE 5201 ATC Advanced Transportation Controller
ITE 5202 ATC Model 2070 Model 2070 Controller Standard
ITE 5401 ATC API Application Programming Interface Standard for the Advanced Transportation Controller
NEMA TS2 Traffic Controller Assemblies Traffic Controller Assemblies with NTCIP Requirements