This page compares independently calculated service metrics with the monthly
figures published on AC Transit's
Key Performance Indicators site.
Percentages are recomputed from raw counts at every rollup; route percentages are never averaged equally.
How this comparison is calculated
Service Operated: following
AC Transit's published formula,
a planned GTFS trip counts as operated when at least one vehicle probe identified that trip. A trip that did
not reach its last passenger-boarding stop still counts as operated and is tracked separately as partial.
On-Time Performance:AC Transit defines on time as
departing a timepoint no more than one minute early and no more than five minutes late. Each interior, pickup-eligible GTFS
timepoint=1 counts once. This project detects stop arrivals rather than departures, so it uses
the detected arrival versus the scheduled arrival as a proxy and excludes origins and final terminals.
A timepoint passes when its delay is inclusively between −60 and +300 seconds. Missing observations on an
operated trip count as failures; the all-scheduled version also counts every timepoint on an unobserved trip
as a failure. This proxy is deliberately labeled because it is not the same underlying CAD/AVL measurement
used by AC Transit.
Route detail: weekday means Monday–Friday and weekend means Saturday–Sunday, based on the
GTFS service date. Service Operated is grouped by each trip’s scheduled first departure; OTP is grouped by
each timepoint’s scheduled arrival. The display periods are Owl (midnight–6 a.m.), Morning (6–10 a.m.),
Midday (10 a.m.–3 p.m.), Afternoon (3–7 p.m.), and Evening (7 p.m.–midnight).
Service Operated
Operated planned trips divided by all planned trips. Monthly and weekly percentages are recomputed from
trip counts rather than averaging daily percentages.
Monthly trip volume behind Service Operated
Blue bars are our calculated counts, stacked by each week segment in the month. Orange bars apply AC
Transit’s published percentage, or its complement, to our GTFS planned-trip total for scale; they are
inferred equivalents, not trip counts published by AC Transit.
On-Time Performance
The operated-service denominator includes timepoints on trips we observed. The all-scheduled denominator
additionally treats timepoints on ghosted trips as failures.
Route KPI summary
Overall independent KPI estimates for each line. Select a route for weekday, weekend, time-of-day,
and underlying count detail.