ISO/TS 19082:2020

TECHNICAL ISO/TS
SPECIFICATION 19082
First edition
2020-01
Intelligent transport systems —
Definition of data elements and data
frames between roadside modules
and signal controllers for cooperative
signal control
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 3
5 Conformance . 3
6 Use cases . 3
6.1 General . 3
6.2 Macroscopic signal control systems . 3
6.3 Micro signal control systems . 4
6.4 Data frames for the use cases . 6
7 Data elements and frames . 7
7.1 General . 7
7.2 Data elements . 7
7.3 Data frames for processsed and statistical data .12
Annex A (informative) Relationship with existing standards .19
Bibliography .21
Foreword
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iv © ISO 2020 – All rights reserved

Introduction
Signal controllers and traffic control centres optimize signal timings based on real-time traffic
information for each approach. For example, signal controllers may extend the green time for an
approach with a long queue.
The aim of this document is to define data elements and data frames that are useful for optimising local
and coordinated signal operations.
ISO 22951 (PRESTO) specifies the message sets for signal system pre-emption and priority for transit
vehicles including communications between roadside modules and signal controllers. This document
complements PRESTO by defining message sets for traffic information that is useful for optimizing
normal signal operations. Thus, signal controllers and traffic management centres can generate signal
timings referring to the messages of PRESTO and this document.
The red arrows in Figure 1 illustrate message flows that are within scope of this document.
Figure 1 — Physical scope of this document
TECHNICAL SPECIFICATION ISO/TS 19082:2020(E)
Intelligent transport systems — Definition of data
elements and data frames between roadside modules and
signal controllers for cooperative signal control
1 Scope
This document specifies data elements and data frames for messages
a) exchanged between roadside modules and:
1) signal controllers,
2) traffic management centres, and/or
3) other roadside modules.
b) exchanged between traffic management centres and signal controllers.
NOTE Roadside modules can generate data based on inputs from vehicle detectors and/or probe data
transmitted by vehicles. This document does not address how the roadside module generates the data; it only
addresses communication after receiving and processing raw data from one or more sources.
EXAMPLE A roadside module can calculate vehicle volume, average speed, and queue length by utilizing
data from vehicle detectors and probe information.
The data structure follows the framework specified in ISO 14817-1, and the data elements and data
frames are described by description name, object identifier, definition, and data type following
ISO 14817-1. The specifications of this document complement those from ISO/TS 19091 and other
standards.
The roadside modules can be constructed in any manner using any architecture including the ITS
station as described in ISO 21217, or other hardware and software constructs.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 14817-1, Intelligent transport systems — ITS central data dictionaries — Part 1: Requirements for ITS
data definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14817-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
adaptive signal control
signal control concept where vehicular traffic in a network is detected at one or more points upstream
and/or downstream and algorithmically combined with other information to predictively optimize
traffic signal operations
3.2
conflicting turn
turn manoeuvre that conflicts with another manoeuvre at an intersection
3.3
cooperative signal control
signal control utilizing not only vehicle detector data but also V2I communication data
3.4
dilemma zone
area upstream of a traffic signal in which different drivers are likely to make different decisions on
whether they should continue through or stop at the signal as they see the signal indication change
from green to yellow
Note 1 to entry: There are two types of dilemma zones. Type I occurs when yellow and red clearance times are too
short for a driver to either stop or clear the intersection before the beginning of a conflicting phase. Type II, also
known as an “Option Zone”, or “Indecision Zone”. This occurs as the result of different drivers making different
decision on whether to go or stop, upon the change from a green to yellow indication.
3.5
flow rate
equivalent hourly rate at which vehicles, bicycles, or persons pass a point on a lane, roadway, or other
trafficway, computed as the number of vehicles, bicycles, or persons passing the point, divided by the
time interval (usually less than 1 h) in which they pass
Note 1 to entry: It is expressed as vehicles, bicycles, or persons per hour.
3.6
phase
signal controller timing unit associated with the control of one or more movements
3.7
probe data
vehicle sensor information, formatted as probe data elements and/or probe messages, that is processed,
formatted, and transmitted to a roadside module to create a good understanding of the driving
environment
3.8
queue
line of vehicles, bicycles, or persons waiting to be served by the system in which the flow rate from the
front of the queue determines the average speed within the queue
Note 1 to entry: Slowly moving vehicles or people joining the rear of the queue are usually considered part of
the queue. The internal queue dynamics can involve starts and stops. A faster-moving line of vehicles is often
referred to as a moving queue or a platoon.
3.9
roadside module
group of components, or applications, installed at the roadside that can be controlled and/or monitored
by a remote entity
3.10
signal controller
roadside module that manages the right-of-way at an intersection, typically by displaying green, yellow,
and red indications to the intersection’s various approach lanes
2 © ISO 2020 – All rights reserved

4 Symbols and abbreviated terms
PRESTO Data Dictionary and Message Sets for Pre-emption and Prioritization Signal System for
Emergency and Public Transport Vehicles
5 Conformance
In order to claim conformance with this document, the structure of data elements and the data frames
between roadside modules and signal controllers shall follow the data types described in Clause 7.
6 Use cases
6.1 General
This Clause describes several usage examples where data defined within this document can be used.
6.2 Macroscopic signal control systems
Many adaptive signal control systems perform macroscopic control functions on a central computer,
which determines the signal parameters such as cycle length, split and offset based on congestion
information. These systems aim to reduce delays and stops by improving the timing efficiency of green
indications at critical intersections and maximizing traffic capacity.
Conventionally, volumes and occupancy from vehicle detectors have been used for the input of these
systems; the introduction of connected vehicles now allow probe data to be used for this purpose
(Figure 2). Probe data can be received over short range communication technologies and processed by
roadside modules; the processed data can then be transferred to traffic control centres. Probe data can
also be collected via wide area communication. In this case, the central computers process the collected
raw probe data and calculate signal parameters by combining processed probe data transferred from
roadside modules (but care must be taken not to duplicate data
...