Technical Resources

Standards Resources

The following is a listing of the most recent publications for this topic.

PUBLICATION TITLE
Connected Intersections (CI) Implementation Guidance Version 1 Released
The Institute of Transportation Engineers (ITE), on behalf of the Connected Intersections Project Committee, is pleased to announce the publication of the Connected Intersections (CI) Implementation Guide, known also as Connected Transportation Interoperability (CTI 4501 v01.00). This initial version of the CI Implementation Guide provides a detailed interface specification that can be used by the ITS community to deploy a nationally interoperable, openly available broadcast providing traffic Signal Phase and Timing and associated required mapping ("MAP") information that can be received by connected vehicles and other interested participants in the transportation system. This information enables applications such as Red Light Violation Warning and others that can increase both safety and efficiency. The Connected Intersections Project Committee accomplished this effort with broad stakeholder representation including standards development organizations , Intelligent Transportation Systems (ITS) infrastructure owner operators (IOOs), automotive original equipment manufacturers and suppliers, infrastructure equipment vendors, security specialists, ITS integrators, and end-users of data and services.
Jan 13, 2022
Roadside Unit Standard Version 1 Released
The Institute of Transportation Engineers, on behalf of the Roadside Unit (RSU) Standardization Working Group is pleased to announce the publication of RSU Standard Version 1.0, also known as Connected Transportation Interoperability (CTI 4001 v01.00). The RSU Standard is a non-proprietary, technology neutral, industry-based consensus standard for roadside units, based on stakeholder inputs and existing resources such as the RSU Specification Version 4.1, NEMA's TS-10 Connected Vehicle Infrastructure – Roadside Equipment Standard as well as lessons learned from pilot deployments. The RSU Working Group accomplished this effort with broad stakeholder representation including standards development organizations (SDOs), infrastructure owner operators (IOOs), automotive original equipment manufacturers (OEMs) and suppliers, infrastructure equipment vendors, security specialists, Intelligent Transportation Systems (ITS) integrators, and end-users of data and services
Jan 13, 2022
CTI 4001 v01.00, Roadside Unit (RSU) Standard
The Connected Transportation Interoperability (CTI) family of standards are a series of documents that are jointly developed by stakeholders across the connected vehicle spectrum, including infrastructure owner operators (IOOs), the automotive industries, device manufacturers, mobility data providers, and systems integrators. Sponsored by USDOT and approved and maintained by the following Standards Development Organizations (SDOs), including AASHTO, ITE, NEMA and SAE International. Documents in the CTI family includes standards and technical reports that provide guidance to develop and maintain an interoperable connected vehicle environment. This Roadside Unit (RSU) Standard v01 supersedes USDOT's Dedicated Short-Range Communications Roadside Unit Specifications v4.1. This RSU Standard v01 was developed by engaging with stakeholders representing the industry at large, including but not limited to infrastructure owner operators, automobile original equipment manufacturers (OEMs), RSU manufacturers, and the end users of data and services. This document establishes a non-proprietary, communications-agnostic, industry-based consensus RSU Standard
Nov 10, 2021
CTI 4501 v01.00, Connected Intersections (CI) Implementation Guide
The Connected Transportation Interoperability (CTI) family of standards are a series of documents that are jointly developed by stakeholders across the connected vehicle spectrum, including infrastructure owner operators (IOOs), the automotive industries, device manufacturers, mobility data providers, and systems integrators. The documents in the CTI family are sponsored by USDOT and approved and maintained by the following Standards Development Organizations (SDOs), including AASHTO, ITE, NEMA and SAE International and includes standards and technical reports that provide guidance to develop and maintain an interoperable connected vehicle environment. This CI Implementation Guide address the ambiguities and gaps identified by early deployers and provides guidance to generate messages and develop applications for signalized intersections that are interoperable across the United States, especially for the automated transportation systems. This document focuses on harmonizing the existing signal phase and timing (SPaT) messages deployed, using the USDOT sponsored Cooperative Automated Transportation Clarifications for Consistent Implementations (CCIs) To Ensure National Interoperability Connected Signalized Intersections as a starting point.
Nov 10, 2021
ATC 5401 v02A
ATC 5401 v02A is an update to the previously approved ATC 5401 v02.17. The standard is designated as ATC 5401 v02A (as published) and should be cited as ATC 5401 v02A to distinguish it from previous publications of the standard. Anyone using ATC 5401 v02A should seek information about the version number that is of interest to them in any given circumstance. Conforming software based on later, or higher, version numbers may not be compatible with conforming software based on earlier, or lower, version numbers.
Jun 2, 2021
ATC 5201 v06
This is a connected intersection-ready Advanced Transportation Controller (ATC) Standard family developed by AASHTO, ITE, and NEMA
May 13, 2021
Guide to V3.1 Traffic Management Data Dictionary (TMDD) Standard for Center to Center Communications
Guide to V3.1 Traffic Management Data Dictionary (TMDD) Standard for Center to Center Communications
May 7, 2020
TMDD Standard v3.1 - Volume I Concept of Operations and Requirements
TMDD Standard v3.1 - Volume I Concept of Operations and Requirements
Mar 12, 2020
TMDD Standard v3.1 - Volume II Design Content
TMDD Standard v3.1 - Volume II Design Content
Mar 12, 2020
Notice of Intent to Adopt ATC 5401 Standard v02A - PDF
Notice of Intent to Adopt ATC 5401 Standard v02A - PDF
Feb 11, 2020
Notice of Intent to Adopt ATC 5401 Standard v02A - Word
Notice of Intent to Adopt ATC 5401 Standard v02A - Word
Feb 11, 2020
Recommended Standard ATC 5401 v02A - PDF
Recommended Standard ATC 5401 v02A - PDF
Feb 11, 2020
Recommended Standard ATC 5401 v02A - Word
Recommended Standard ATC 5401 v02A - Word
Feb 11, 2020
Standard Development Report for ATC 5401 v02A - PDF
Standard Development Report for ATC 5401 v02A - PDF
Feb 11, 2020
Standard Development Report for ATC 5401 v02A - Word
Standard Development Report for ATC 5401 v02A - Word
Feb 11, 2020
Notice of Intent to Adopt ATC 5201 Standard v06A
Notice of Intent to Adopt ATC 5201 Standard v06A
Jan 17, 2020
Notice of Intent to Adopt NTCIP 1218 v01 Object. Definition for RoadSide Units (RSU)
Notice of Intent to Adopt NTCIP 1218 v01 Object. Definition for RoadSide Units (RSU)
Jan 15, 2020
ATC Joint Committee Web Conference Notes 06/20/19
ATC Joint Committee Web Conference Notes 06/20/19
Jan 14, 2020
Controller Working Group Comments on ATC 5201 v06.25
Controller Working Group Comments on ATC 5201 v06.25
Jan 14, 2020
Recommended Standard ATC 5201 v06A - PDF
Recommended Standard ATC 5201 v06A - PDF
Jan 14, 2020