{
  "title": "Reconciliation check: California Waymo mileage, CPUC vs. Waymo's own S2 benchmark",
  "purpose": "Both figures below independently describe 'how many miles has Waymo driven in California,' reported through two different channels. This is published as a transparency check, not a claim that the numbers should match -- see caveats.",
  "cpuc_side": {
    "source": "CPUC AV Program deployment reports, Waymo Driverless Deployment, California",
    "months_covered": 32,
    "month_range": [
      "2023-08",
      "2026-06"
    ],
    "note": "Sum of VMT Period 1+2+3 across all CPUC-reported months currently ingested for Waymo's Driverless Deployment program. Known gaps exist (see Activity page) -- this is NOT a complete monthly series, so it understates true cumulative VMT over the same period.",
    "total_vmt": 138875300.0
  },
  "waymo_s2_side": {
    "source": "Waymo self-published S2-cell safety benchmark data, California, latest vintage",
    "vintage_end": "202603",
    "note": "Cumulative 'RO miles' (revenue/operations miles) for California as of this vintage's reporting window. Scope (e.g. whether Pilot-program or non-passenger miles are included) is not documented in the source file.",
    "total_miles": 118893629.0
  },
  "caveats": [
    "Different accounting windows: CPUC is a sum of specific reported months (with gaps); Waymo S2 is a cumulative total through a vintage's end date.",
    "Different scope: CPUC's figure is Driverless Deployment program VMT only; Waymo S2's 'RO miles' scope is not documented and may be broader (e.g. include Pilot/drivered miles).",
    "Different VMT definitions: CPUC's VMT Period 1/2/3 categories are CPUC's own reporting-template definitions, not independently confirmed against Waymo S2's 'RO miles' definition in the sources ingested so far.",
    "A large gap between these numbers is expected given the above, not evidence of a data error in either source."
  ]
}