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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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320 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
caterpillar effect, and improve fuel efficiency to name a few. However, these goals must not be achieved
by exceeding the roadway limitations as governed by Federal, State and Local authorities and agencies.
Thus, the broadcasting of the speed limit value for the teaming zone provides the speed limitation required
for safe and successful teaming operations in the particular zone of interest. In absence of a speed limit, a
vehicle shall make the assumption that teaming operations are unavailable for the current zone. This
possibility may occur in areas where RSE coverage is not as saturated. Once a vehicle enters an RSE
coverage zone, authorization for teaming operations may be received.
FHWA Vehicle Classes
FHWA Vehicle Class has been previously defined for the SAE J2735. A detailed discussion of the FHWA
vehicle Class definitions may be found at the FHWA Office of Highway Policy Information. An excerpt of
this information follows.
FHWA Vehicle Classes with Definitions
Motorcycles -- All two or three-wheeled motorized vehicles. Typical vehicles in this category
have saddle type seats and are steered by handlebars rather than steering wheels. This category
includes motorcycles, motor scooters, mopeds, motor-powered bicycles, and three-wheel
motorcycles.
Passenger Cars -- All sedans, coupes, and station wagons manufactured primarily for the
purpose of carrying passengers and including those passenger cars pulling recreational or other
light trailers.
Other Two-Axle, Four-Tire Single Unit Vehicles -- All two-axle, four-tire, vehicles, other than
passenger cars. Included in this classification are pickups, panels, vans, and other vehicles such
as campers, motor homes, ambulances, hearses, carryalls, and minibuses. Other two-axle, four-
tire single-unit vehicles pulling recreational or other light trailers are included in this classification.
Because automatic vehicle classifiers have difficulty distinguishing class 3 from class 2, these two
classes may be combined into class 2.
Buses -- All vehicles manufactured as traditional passenger-carrying buses with two axles and
six tires or three or more axles. This category includes only traditional buses (including school
buses) functioning as passenger-carrying vehicles. Modified buses should be considered to be a
truck and should be appropriately classified.
NOTE: In reporting information on trucks the following criteria should be used:
1.
Truck tractor units traveling without a trailer will be considered single-unit trucks.
2.
A truck tractor unit pulling other such units in a "saddle mount" configuration will be
considered one single-unit truck and will be defined only by the axles on the pulling unit.
3.
Vehicles are defined by the number of axles in contact with the road. Therefore, "floating"
axles are counted only when in the down position.
4.
The term "trailer" includes both semi- and full trailers.
Two-Axle, Six-Tire, Single-Unit Trucks -- All vehicles on a single frame including trucks,
camping and recreational vehicles, motor homes, etc., with two axles and dual rear wheels.
Three-Axle Single-Unit Trucks -- All vehicles on a single frame including trucks, camping and
recreational vehicles, motor homes, etc., with three axles.
Four or More Axle Single-Unit Trucks -- All trucks on a single frame with four or more axles.