ISO 14819-2:2021 Intelligent transport systems — Traffic and travel information messages via traffic message coding —Part 2: Event and information codes for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

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Intelligent transport systems — Traffic and travel information messages via traffic message coding —Part 2: Event and information codes for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C是国际标准化组织发布的ISO标准，适用于世界范围。

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Intelligent transport systems — Traffic and travel information messages via traffic message coding —

Part 2: Event and information codes for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

1 Scope

ISO 14819-1 describes the ALERT-C protocol concept and message structure used to achieve densely coded messages to be carried in the RDS-TMC feature. This document specifies the ‘Events List’ to be used in coding those messages.

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 14819-1, Intelligent transport systems — Traffic and Travel information messages via traffic message coding — Part 1: Coding Protocol for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

IEC 62106 (all parts), Specification of the Radio Data System (RDS) for VHF/FM sound broadcasting in the frequency range from 64,0 to 108,0 MHz

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://w ww. iso. org/o bp

— IEC Electropedia: available at http://w ww.e lectropedia .org/ 4 Event and Information codes for Traffic Message Channel

4.1 Event List

4.1.1 Explanatory notes

a) The event list is divided into update classes, indicated by the various sections. These update classes are used for terminal message management, as indicated in ISO 14819-1:2021, 6.1. The event list is shown in the format of a database.

NOTE The first column of the Event list in 4.1.3 (Table 2) shows line numbers to assist reading and use of the database.

b) The second column gives a ‘technical language’ (so-called CEN-English) description of the event code, the code of which is shown in the third field. Appropriate authorities of each country have been responsible for the exact descriptions in other languages, in conformity with the definitions

given in the DATEX Data Dictionary. This document uses the English language and metric units by default, but is essentially both language- and unit-independent, as presentation to the end-user’s preference is made by the client device: the recommended conversions from metric to non-metric (i.e. imperial) units are given in Annexes A, B, C and D.

This ensures precise definitions and use of the event codes in the transmission layer. Individual terminal implementations may handle these (translated) descriptions with some flexibility in order to allow a more effective presentation, but without altering the meaning.

c) The third column gives the decimal equivalent of the actual binary event code to be transmitted (see ISO 14819-1:2021, 5.3.2). These codes are purely internal to the RDS-TMC system and should not be used for referencing events or composing messages in other operator systems. Undefined codes are reserved for future system additions.

d) The fourth column, "N", is the nature of the event. The general meaning of the codes is as follows:

(blank) - Information

F - Forecast

S - Silent: no message shall be presented to the end-user

e) The fifth column, "Q", is the quantifier field, containing the reference numbers of quantifiers listed in the table at the end of the event list. The position of the quantifier in the event, plus in some cases some accompanying words, is shown by (...Q...) within the text. Use of these quantifiers is usually optional. However, a few event messages have no meaning without the quantifier. The use of quantifiers is described in ISO 14819-1:2021, 5.5.6.

f) The sixth column, "T", is the duration type. "D" indicates "dynamic" events of short duration and "L" indicates longer-lasting events (see ISO 14819-1:2021, 5.4.7). If this code is bracketed ( ), or if the time-of-day quantifier (no.7) is actually used in the message, no duration shall be presented to the user. In these cases, the duration indicates persistence, used for message management only.

g) The seventh column, "D", is the default directionality of the event. "1" indicates that one direction of traffic is normally affected by the event. "2" indicates that both directions of traffic are normally affected by the event. TMC terminals can use this field to help to determine which events to present to the driver and how to present them.

h) The eighth column, "U", is the default terminal urgency, with values "X" for extremely urgent, "U" for urgent, and blank for normal events (see ISO 14819-1:2021, 5.4.5).

i) The ninth column, "C", gives a numerical representation of the update class to which the event belongs. Update classes 1…31 are listed in 4.1.3. Update classes 32…39 are exclusively for events of the forecast nature "F" with duration type L or (L). These are in subclause 4.3.2. Other than events of type S, these classes contain no other events.

j) The tenth column, “P”, if it contains a code, indicates an event that experience has shown can be misinterpreted. As such, this event may be deprecated in due course. The code in this cell indicates the code that should be used in preference, as it better represents the event.

k) The final column, "R", gives phrase codes (references) for use by TMC operators. An event may be a single phrase event, or a combination of two or more phrases. Each phrase is allocated a phrase code consisting of at least of a single code letter (A - Z) and a code number (1 - 999). Single phrase events are indicated by a single code letter and a one or two digit number (e.g. A1 - A99); expected events are indicated by the normal phrase code followed by "E" (e.g. A1E), and where a risk of danger exists by a following "D" (e.g. G6D); events with quantifiers can have three digits (e.g. A101). Longer lasting forecasts are indicated by the letter "F".

The Event List also contains several predefined combinations of single phrase events to make better use of the available channel capacity. These combined events are indicated by the combined codes of the constituent phrases (e.g. B11.C1).

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