Final answer:
In an automatic transmission vehicle, the engine can typically be started only when the selector lever is in Park (P) or Neutral (N) to ensure safety and prevent unintentional vehicle movement.
Step-by-step explanation:
In an automatic transmission vehicle, the engine can usually only be started when the selector lever is in either the Park (P) or Neutral (N) positions. This is a safety feature designed to prevent the car from moving unexpectedly during the startup process. It is essential for drivers to be aware of the correct starting position of the selector lever to ensure safety and to prevent damage to the transmission system.