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What is the speedometer's limitation the driver should remember in relation to shifting and following distance?
- A.It predicts future speed exactly
- B.It controls the cruise system
- C.It is accurate only when stopped
- D.It shows speed only at the moment you look; the truck keeps accelerating or slowing, so gear and space decisions must anticipate, not just react
Correct answer
D. It shows speed only at the moment you look; the truck keeps accelerating or slowing, so gear and space decisions must anticipate, not just react
Why
All gauges are snapshots, and a heavy vehicle changes speed slowly but continuously. Using the tachometer and speedometer together, early, is how smooth drivers choose gears before a grade or traffic change forces the issue.
Manual topic: Shifting - Instruments · From the General Knowledge practice bank (GK-362).