Curb weight is defined as

• A. The weight of the vehicle when it has the maximum payload
• B. The weight of the vehicle including typical cargo
• C. The weight of the vehicle with the engine running
• D. The weight of the vehicle when not loaded with passengers or cargo

Answer: (D)

Curb weight is the vehicle’s own weight without any passengers or cargo, including standard equipment and fluids, typically with a full tank of fuel. This is the baseline used to determine how much payload the vehicle can carry and to compute the gross vehicle weight when people or cargo are added. The option that describes the vehicle not loaded with passengers or cargo matches this idea exactly. The other statements refer to weight with payload, or to a dynamic condition (such as the engine running), which are not how curb weight is defined.