Practice question

What does it mean when a loop-detector amplifier is set to 'presence' rather than 'pulse' mode?

  1. It outputs a brief pulse when a vehicle enters or leaves the loop
  2. It maintains the detector output as long as a vehicle remains over the loop
  3. It only detects pedestrians
  4. It disables itself overnight

Answer: B — It maintains the detector output as long as a vehicle remains over the loop

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