Contact

GlossaryResponse performance and resources

Turnout time

What turnout time measures, how it differs from travel time, and why notification and en-route timestamps matter.

Turnout time is the interval between notifying a responding crew of an assignment and the crew beginning its response. It describes the preparation stage before travel: receiving the assignment, getting ready, boarding the vehicle, and starting toward the incident. The precise start and end events must come from the agency's reporting rules.

Washington's fire-service reporting statute provides one clear example. It defines turnout time from notification of the response to the beginning of response time, which starts when units are en route. That is a state-specific definition, not a reason to assume every public dashboard uses identical timestamps. Washington RCW 35.103.020

Where it fits in a response

A caller may already have spent time speaking with a call taker before a crew receives its notification. Turnout therefore does not measure the entire wait for help. Travel follows turnout, and arrival at the recorded scene may precede reaching a patient or beginning work inside a building.

For analysis, keep those stages separate. If total response becomes longer while travel stays steady, the change could be before dispatch or during turnout. A total alone cannot identify the cause. Conversely, reducing turnout by twenty seconds does not establish that the whole response improved by twenty seconds if other stages changed too.

The unit of measurement also matters. A multi-unit incident can have several turnout times. The first engine, a later ambulance, and a replacement unit might receive assignments at different moments. An incident-level measure should explain whether it uses the first dispatched unit, the first arriving unit, or another selected resource.

Example

Hypothetical: A dispatch center receives a call at 10:00:00. It notifies an engine at 10:01:30. The engine marks en route at 10:02:40 and on scene at 10:07:10.

Using notification-to-en-route rules, turnout is 1 minute 10 seconds. Travel is 4 minutes 30 seconds. The interval from call receipt to arrival is 7 minutes 10 seconds. Calling all three numbers “response time” without explanation would obscure which part of the operation each measures.

Suppose a second engine is notified at 10:02:00 and begins responding at 10:03:00. Its turnout is one minute. That does not replace the first engine's interval or mean that both crews began preparing when the original call arrived.

Common confusion

Turnout time is sometimes called chute time. A familiar label still needs a documented definition: an agency might record station alerting, dispatch transmission, acknowledgement, and movement as separate events. Choosing one of those as the starting point changes the calculation.

Dispatch-to-arrival is not necessarily pure travel. San Francisco's police calls explainer labels that interval “travel time,” illustrating why a field name alone cannot establish that preparation time has been excluded. It is a different operational context from the Washington fire-service definition. San Francisco dataset explainer, revised September 2021

A short average also does not show how consistently crews turn out. An average, median, and 90th percentile answer different questions, particularly when some records contain long intervals.

Reading a local report

Look for the notification event, the en-route event, included incident types, and treatment of canceled assignments. Missing or delayed status entries can distort a calculated interval. They should not automatically become zero-second turnouts.

Compare like conditions: staffed stations, volunteer response arrangements, daytime and overnight calls, and emergency versus nonemergency assignments may have different procedures. A stated performance objective is the agency's target for a defined group of responses; the observed turnout distribution shows what the records say happened.

Sources