Running in neutral is a term used to describe a situation in which a vehicle is not accelerating or decelerating, but instead is maintaining its current speed. This is often referred to as idling or being IDLE, and is usually done when the vehicle is stopped or waiting for a signal. The term 'running in neutral' is also used to describe a situation in which a person is not making any progress or taking any action. In both cases, the vehicle or person is not moving forward, but instead is staying in the same place.