UL 4600 and AV Safety Cases

The safety case standard for autonomous vehicles and how regulators use it.

California's April 2026 rules require a structured safety case plus 50,000 or 500,000 test miles per phase before deployment. China's first mandatory Level 3 and 4 safety standard takes effect July 1, 2027.

California AV test miles required per phase: Heavy-duty AV 500,000; Light-duty AV 50,000 CALIFORNIA AV TEST MILES REQUIRED PER PHASE Heavy-duty AV 500,000 Light-duty AV 50,000 MILES
Waymo deployment acceptance criteria
12
Edge Case audit of Aurora
3 months
CA responder response limit
30 sec
Registry incidents
4

Evidence

AV makers publish safety cases; few claim UL 4600 by name

Developments: UL 4600
DateDevelopmentCountryWhat happenedSource
Jun 16, 2025Waymo readiness paperUnited States12 acceptance criteria and a safety case; no UL 4600 claimSource
Apr 28, 2026California DMV AV rulesUnited StatesStructured safety case; heavy-duty AVs authorizedSource
Jun 25, 2026Edge Case assessment of AuroraUnited StatesSafety case found substantively aligned with UL 4600; Aurora CEO sits on Edge Case boardSource
Aug 4, 2026GB 44721-2026 releasedChinaMandatory Level 3 and 4 safety; takeover monitoring for Level 3Source

Registry

Four registry incidents bear on safety cases

Registry incidents linked to this page
IncidentDateRegulator or court action
Uber Test Vehicle Kills Pedestrian in TempeMar 2018Arizona suspended Uber's testing on March 26, 2018. Yavapai County declined to charge Uber in March 2019. NTSB adopted its findings on November 19, 2019. The backup operator pleaded guilty to endangerment in July 2023 and received three years of supervised probation.
Cruise Robotaxi Drags a PedestrianOct 2023California DMV suspended Cruise's driverless permits on October 24, 2023. NHTSA fined Cruise $1.5 million on September 30, 2024, for incomplete crash reports. On November 14, 2024, Cruise admitted filing a false report and agreed to a $500,000 deferred prosecution agreement.
Apollo Go Robotaxi Falls Into a Construction PitAug 2025None found.
Waymo Robotaxis Pass Stopped School BusesSep 2025NHTSA opened preliminary evaluation PE25-013 on October 17, 2025, and wrote to Waymo again on December 3. Waymo counts 12 citations tied to the behavior.

Rules

Safety case standards are voluntary; California and China now require the substance

Key rules and standards: safety cases
RuleJurisdictionWhat it requiresStatus
UL 4600 Edition 3InternationalSafety case for autonomous products including trucksMar 17, 2023
ISO/PAS 8800:2024InternationalSafety of AI elements in road vehiclesDec 12, 2024
ISO 21448 SOTIFInternationalSafety of the intended functionalityPublished 2022
California DMV AV rulesCaliforniaSafety case, phased testing, data reportingAdopted Apr 28, 2026
GB 44721-2026ChinaMandatory Level 3 and 4 safetyEffective Jul 1, 2027

Status colors: green in force, blue voluntary standard or framework, amber adopted and phasing in, gray draft or pending, red withdrawn.

Record

Page Record

Datasets
ai_compliance_evidence.csv (4 rows); registry incidents (4 linked)
Key sources
Waymo readiness paper
California DMV AV rules
Edge Case assessment of Aurora
GB 44721-2026 released
Last verified
October 2026