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SAE J2735-Draft-Rev18 [issued: 06-26-07]
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
3.66 Pedestrian Clearance Time: The time provided for a pedestrian crossing in a crosswalk, after leaving
the curb or shoulder, to travel to the far side of the traveled way or to a median
3.67 pedestrian phase: Definition to be refined by committee.
3.68 Permissive Mode: A mode of traffic control signal operation in which, when a CIRCULAR GREEN
signal indication is displayed, left or right turns are permitted to be made after yielding to pedestrians
and/or oncoming traffic
3.69 Preemption Control: The transfer of normal operation of a traffic control signal to a special control
mode of operation
3.70 Pretimed Operation: A type of traffic control signal operation in which none of the signal phases
function on the basis of actuation
3.71 Protected Mode: A mode of traffic control signal operation in which left or right turns are permitted
to be made when a left or right GREEN ARROW signal indication is displayed
3.72 provider service table: The collection of data describing the applications that are registered with a
WAVE device.
3.73 Red clearance: Definition to be refined by committee.
3.74 Red Clearance Interval: An optional interval that follows a yellow change interval and precedes the
next conflicting green interval
3.75 reference lane: Definition to be refined by committee. The reference lane is a data concept used in
this standard to express the geometric path of a lane approaching an intersection. This information may
then be used by other lanes to "compute" their own similar geometric path.
3.76 Reference Point: Definition to be refined by committee. When map of intersections and other data is
encoded in this standard a reference point is often used to index and offset the data that follows.
3.77 registration: One of three modes, or states, of operation known as Registration, Initialization, and
Operations which DSRC systems operate in. The Registration mode is the process by which critical
parameters pertaining to the device and applications using it are entered into the device's Management
Information Base (MIB). Registration must be completed before a DSRC device can be ready for
operations. The registration process is defined in IEEE P1609.3 and is controlled by the WAVE
Management Entity (WME).
3.78 road side unit: A Road Side Unit (RSU) is a DSRC device used to transmit to, and receive from,
DSRC equipped moving vehicles (OBUs). The RSU transmits from a fixed position on the roadside
(which may in fact be a permanent installation or from "temporary" equipment brought on-site for a period
of time associated with an incident, road construction, or other event). RSUs have the ability to transmit
signals with greater power than OBUs and may have TCIP/IP connectivity to other nodes or the Internet.