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SAE J2735-Draft-Rev26 [issued: 09-18-08]
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
or meaning associated with the data elements as concepts that describe or provide information about real or
abstract entities. A data registry may contain abstract data concepts that do not get directly represented as
data elements in any application system, but which help in information interchange and reuse both from the
perspective of human users and for machine-interpretation of data elements. Within the ITS industry, there
is a data registry established and run by the IEEE which contains the contents of this standard. SAE and
the ATIS committee have also developed tools to access and use the data found in the registry as an aid to
deployments.
3.24 data structure: Any construct (including data elements, data frames, and other data concepts) used to
represent the contents of a data dictionary.
3.25 data type: A classification of the collection of letters, digits, and/or symbols used to encode values of
a data element based upon the operations that can be performed on the data element. For example, real,
integer, character string, Boolean, bitstring, etc.
3.26 dialog: A sequence of two or more messages which are exchanged in a known sequence and format
(typically of a request followed by one or more replies), which are considered a bound transactional
exchange between the parties.
3.27 dual-arrow signal section: A type of signal section designed to include both a yellow arrow and a
green arrow.
3.28 egress: In the context of this standard an egress is a flow of vehicular or other types of traffic leaving
an intersection on one or more of the defined lanes of travel.
3.29 encounter: In the context of this standard an encounter is an exchange of messages between two or
more DSRC equipped devices (OBUs or RSUs) lasting for a brief period of time.
3.30 entity: Anything of interest (such as a person, place, process, property, object, concept, association,
state, event, etc.) within a given domain of discourse (in this case within the ITS domain of discourse).
3.31 entity type: An abstract type of structure defined in the ITS data register but no longer used. There
are no entity types defined in this standard.
3.32 EtherType: The Ethernet Type field, as defined in RFC 1042, used to indicate the higher layer
protocol above Logical Link Control.
3.33 flashing mode: A mode of operation in which at least one traffic signal indication (but more typically
all signal indication of the entire signalized intersection) in each vehicular signal face of a highway traffic
signal is turned on and off repetitively. Expressed in the terminology of the SPAT message, this is
reflected in the descriptions of signal states of the affected lanes (in that movement) being set to red
flashing.
3.34 Force off: Definition to be refined by committee.
3.35 full-actuated operation: A type of traffic control signal operation in which all signal phases function
on the basis of actuation.
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