Practice question

When positioning a stationary shadow truck equipped with a Truck-Mounted Attenuator (TMA) upstream of a work crew, what factor determines the required roll-ahead distance?

  1. The length of the advance warning sign array and number of warning signs posted.
  2. The height of the TMA display board lights.
  3. The mass of the shadow vehicle and traffic speed.
  4. The total width of the paved road shoulder.

Answer: C — The mass of the shadow vehicle and traffic speed.

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