The SFMTA has begun using a new vehicle locating system to measure on-time performance based on departure times, rather than arrival times as in the previous system. This is consistent with changes to internal methodology and, among other advantages, allows for better measurement of on-time performance at the beginnings of trips as vehicles depart from their origin terminals. The change in methodology will be reflected in the April 2019 data and going forward. Records prior to April 2019 measure the on-time performance of arrivals.

March 2020-August 2020 data in process of being finalized.