Spare ratio

A spare ratio or spares ratio is the percentage of unused vehicles operated by a public transport operator during peak service periods. It is calculated as a simple percentage of the total fleet size.[1]

In the United States, the Federal Transit Administration (FTA) sets a 20 percent guideline for the spare ratio in a fleet of at least 50 vehicles.[2]

References
  1. MacKechnie, Christopher (May 31, 2016). "Transit 101: The Spare Ratio". About.com. Retrieved August 1, 2016.
  2. "FTA Circular 9030.1C: Urbanized Area Formula Program: Program Guidance and Application Instructions". Federal Transit Administration. August 27, 2012. p. 5. Retrieved August 1, 2016.
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