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Which measurement establishes the road load figures?

  • A.A coastdown from a defined speed on a level surface, from which the resistance at each speed is derived
  • B.A coastdown test on a level track
  • C.A calculation, which is performed from the dimensions and the mass of the vehicle without any measurement
  • D.Nothing

Answer: B

A coastdown measures the actual resistance the vehicle experiences. The last option describes exactly that procedure, which makes it a correct and more detailed version of the same answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming what changes and what stays the same is the reliable route through questions of this shape. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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