What is meant by the term "secondary runway"?

The term "secondary runway" refers to a runway that is not the primary runway used for takeoffs and landings. In most airports, there is typically one primary runway that is preferred for regular operations due to its alignment, length, and other factors. The secondary runway is available for use when the primary runway is closed, congested, or when conditions suggest its use could optimize operations. This secondary runway can accommodate additional air traffic, provide alternate landing options, or serve specific operational needs without compromising the efficiency of the primary runway.

The other options, while they describe different types of runways or uses, do not accurately capture the meaning of "secondary runway." The primary distinction of this term is its relationship to the primary runway, emphasizing its role in supporting the airport's operational capacity rather than fulfilling specific functions like emergency landings or dedicated cargo operations.