Perception-Reaction Time (PRT) consists of which components?

• A. Detection
• B. Identification
• C. Decision
• D. Detection, Identification, Decision, Response

Answer: (D)

Perception-Reaction Time is the total time from when a hazard is noticed to when a driver begins to react. That total is made up of four sequential parts: detection, identification, decision, and the response (movement) time.

Detection is the moment you notice something in the environment. Identification is recognizing what that thing is. Decision is choosing what action to take based on that recognition. Response is the actual motor action that starts the chosen course (braking, steering, etc.). All four steps happen in order, and together they constitute the full time from noticing a hazard to initiating action. If you only count one or two parts, you’re missing portions of the processing and the motor execution, so the complete set is required.