ITS4US Performance Measure 3
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PM-3: Trips Unfulfilled Due to System Unreliability
Metric Description: Refers to the system’s ability to monitor capacity and reliability to ensure that the requested trips are not denied, and if trips were booked, then the number of missed trips are minimized by providing a reliable service. A missed trip event occurs when a driver arrives after the pickup window has passed. The metrics include the following:
- Number of trips returning a “seat unavailable” or other error as a percentage of all trips requested.
Target:
- Less than 10% of requests returned as “seat unavailable” or “other error” within one session.
Data source: VOC data
Update frequency: Monthly, with graph showing average

Updated: August 2026
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