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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.
3.81 signal section: Two or more traffic control signals operating in signal coordination.
3.82 signal system: Two or more traffic control signals operating in signal coordination.
3.83 signal timing: The amount of time allocated for the display of a signal indication, slang.
3.84 SPAT: In the context of this standard, Signal Phase And Timing (SPAT), is a message type which
describes the current state of a signal system and its phases and relates this to the specific lanes (and
therefore to movements and approaches) in the intersection. It is used along with the MAP message to
allow describing an intersection and its current control state.
3.85 split (phase): In split phase operations opposing turn lanes are coordinated at differing times. For
example, the east and west left turn movements would get green arrows at different times.
3.86 split (signal): Signal split is a term having to do with coordinated signals. Signal split pertains to time
allocated to the coordinated road vs. the cross streets.
3.87 stability control: A system which operates to prevent a car from sliding sideways under dynamic
driving conditions.
3.88 station: Any device that contains an IEEE 802.11 conformant medium access control (MAC) and
physical layer (PHY) interface to the wireless medium. An RSU and OBU are stations.
3.89 stop line: The stop line is a defined location along the path of the lane type where users (vehicles) are
presumed to stop and come to rest at the edge of the intersection. The stop line is used as the starting point
to define the centerline path of a lane in the messages (with sets of offset points defining the path of the
lane proceeding away from the stop line). While stop lines are normally considered for lanes describing
motorized vehicle travel, they are also used on other forms of lanes (such as pedestrian walkway lanes) to
describe the initial point of the path.
3.90 syntax: The structure of expressions in a language, and the rules governing the structure of a
language.
3.91 transactions: Bi-directional data exchanges between devices (RSUs and OBUs).
3.92 value domain: A well known range of values, or terminology, or enumeration that many be
referenced as an abstract type the ITS data register but no longer used. There are very many value domains
used in ITS standards.
3.93 vehicle host: A device connecting to the WAVE system through the OBU vehicle host interface.
3.94 vehicle type: In the context of this standard the vehicle type is a data element used to define overall
gross size and mass of a vehicle, Observe that this definition differs from the (multiple other) vehicle types
defined elsewhere in other standards used in the ITS.
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