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Which flash rate is specified for direction indicators?

  • A.Exactly 60 flashes per minute, which is the rate specified in order that the signal may be recognised readily
  • B.About 30 per minute
  • C.Between 30 and 60 flashes per minute, which is slow enough to be seen clearly at a considerable distance
  • D.Between 60 and 120 flashes per minute

Answer: D

Regulations allow sixty to a hundred and twenty flashes per minute. A rate outside that range indicates a fault, which is why a failed bulb produces the familiar rapid flashing on many vehicles. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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