In an automotive context, the term refers to a disengaged transmission state. When selected, the engine is disconnected from the drive wheels, allowing it to run freely without propelling the vehicle. For example, while stopped at a traffic light, shifting to this position prevents the vehicle from moving forward even with the engine running.
This state is essential for various functions, including starting the engine, idling without forward movement, and allowing the vehicle to be towed without causing damage to the transmission. Historically, its implementation has evolved from simple mechanical linkages to sophisticated electronic controls, but its fundamental purpose of decoupling engine power from the wheels remains consistent.
