Definitions - Trailer Mass


Unladen weight of trailer.

Aggregate Trailer Mass (ATM)

The total mass of the laden trailer when carrying the maximum load recommended by the manufacturer. This includes any mass imposed upon the drawing vehicle when the combination vehicle is resting on the horizontal supporting plane.

Gross Trailer Mass (GTM)

The mass transmitted to the ground by the axle or axles of the trailer when coupled to a drawing vehicle and carrying its' maximum load approximately uniformly distributed over the load bearing area.

Note: These definitions are in accordance with the ADRs and may differ from other definitions in use.

Note: Except for semi-trailers, the difference between the ATM and GTM is usually small.

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