Waiting in Neutral is a term used to describe a situation where a vehicle is not moving, but the engine is still running. This is also known as idling, which is the six letter answer to the crossword puzzle. Idling is often done when a driver is waiting for someone or something, such as a traffic light to change, or for a passenger to get into the car. Idling can also be used to warm up a vehicle in cold weather. Idling for long periods of time can be wasteful and damaging to the environment, so it is important to turn off the engine when waiting for extended periods.