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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
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.
3.36 functional-area data dictionary (FADD): A data dictionary that is intended to standardize data
element syntax, and semantics, within and among application areas within the same functional area. This
DSRC standard is a FADD.
3.37 GID layer: Definition to be refined by committee.
3.38 ingress: In the context of this standard an egress is a flow of vehicular or other types of traffic
approaching an intersection on one or more of the defined lanes of travel.
3.39 initialization: One of three modes, or states, of operation known as Registration, Initialization, and
Operations which DSRC systems operate in. The Initialization mode is used to establish a direct
connection (link) between two DSRC devices. It is comparable to, but not equivalent to, an IEEE 802.11
association.