Local Roadway Devices

Status

Existing

Description

Roadway Devices are controlled by operators in local Traffic Management Centers. These devices aid operators in the traffic management center with the monitoring and managing of local agencies' traffic conditions. The field equipment that currently does or will aid these operators include traffic signals, parking monitoring, message signs, traffic sensors, railway guards and CCTV Cameras.

Stakeholders

StakeholderRoleRole Status
Local Traffic Management AgenciesOwnsExisting

Physical Objects

ITS Roadway Equipment
Connected Vehicle Roadside Equipment

Functional Objects

Functional ObjectDescriptionUser Defined
Roadway Basic Surveillance'Roadway Basic Surveillance' monitors traffic conditions using fixed equipment such as loop detectors and CCTV cameras.False
Roadway Environmental Monitoring'Roadway Environmental Monitoring' measures environmental conditions and communicates the collected information back to a center where it can be monitored and analyzed or to other field devices to support communications to vehicles. A broad array of general weather and road surface information may be collected. Weather conditions that may be measured include temperature, wind, humidity, precipitation, and visibility. Surface and sub–surface sensors can measure road surface temperature, moisture, icing, salinity, and other measures.False
Roadway Field Management Station Operation'Roadway Field Management Station Operation' supports direct communications between field management stations and the local field equipment under their control.False
Roadway Signal Control'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.False
Roadway Signal Preemption'Roadway Signal Preemption' includes the field elements that receive signal preemption requests from emergency vehicles approaching a signalized intersection and overrides the current operation of the traffic signals to stop conflicting traffic and grant right–of–way to the approaching vehicle.False
Roadway Traffic Information Dissemination'Roadway Traffic Information Dissemination' includes field elements that provide information to drivers, including dynamic message signs and highway advisory radios.False
Roadway Work Zone Traffic Control'Roadway Work Zone Traffic Control' controls traffic in areas of the roadway where maintenance and construction activities are underway, monitoring and controlling traffic using field equipment such as CCTV cameras, dynamic messages signs, and gates/barriers. Work zone speeds and delays are provided to the motorist prior to the work zones.False

Physical Standards

SDODocument #TitleUser Defined
ITEITE ATC 5201Advanced Transportation Controller (ATC)False
ITE ATC 5202Model 2070 Controller StandardFalse
ITE ATC APIApplication Programming Interface (API) Standard for the Advanced Transportation Controller (ATC)False
ITE ITS CabinetITS Standard Specification for Roadside CabinetsFalse
NEMANEMA TS 2Traffic Controller Assemblies with NTCIP RequirementsFalse
NEMA TS 4Hardware Standards for Dynamic Message Signs (DMS) with NTCIP RequirementsFalse
NEMA TS 5Portable Traffic Signal Systems (PTSS) Standard Control Circuit and Pilot DevicesFalse
NEMA TS 8Cyber and Physical Security for Intelligent Transportation Systems (ITS)False
USDOTRSU V4USDOT Roadside Unit (RSU) Specification Document – Version 4False

Interfaces To

(View Context Diagram)

Local Emergency Vehicles
Local Maintenance and Construction Management Center
Local Traffic Management Center
Public / Private Transit Vehicles