{"id":"bf459530-b666-415c-8b4e-576d1ce1ca85","slug":"tier-iv-kumamoto-bus-rear-ended-2025-01","kind":"collision","headline":"TIER IV autonomous bus rear-ended by public bus during Kumamoto test run","summary":"On January 30, 2025, a TIER IV Minibus 2.0 autonomous bus operating under a trial in Kumamoto City was rear-ended by a following public bus at the Umayabashi intersection near Kumamoto City Hall. The autonomous bus was operating normally at the time. No injuries were reported among the 4 passengers on the autonomous bus or 15 on the following vehicle. The incident caused damage requiring repairs and delayed the public trial launch from February 10 to March 21, 2025. Sensors and autonomous driving system were confirmed unaffected.","occurredAt":"2025-01-30T06:34:00.000Z","reviewStatus":"reviewed","modelId":"cdcb0582-9fe1-4ae8-9ab2-968a54040a11","deploymentId":"2e5b5989-03d1-44fc-a4e5-d0f023415544","companyId":null,"dataCenterId":null,"aliases":[],"collisionRisk":"none","reviewNote":null,"severity":"minor","rootCauseCategory":null,"rootCauseDetail":null,"affectedUnitsCount":null,"affectedUnitsBasis":null,"remediationStatus":"remediated","regulatoryAction":"none","regulatoryBody":null,"propertyDamageEstimateUsd":null,"damageEstimateBasis":null,"bodilyInjurySeverity":null,"fatalityCount":null,"lossCostClass":null,"sourceQualityTier":null,"oshaRecordable":null,"oshaCaseNumber":null,"rootCauseDisclosed":null,"publicDisclosureDate":null,"insuranceClaimPublic":null,"formFactor":"brain","latitude":null,"longitude":null,"autonomyClass":null,"legalOutcomeClass":"unknown","createdAt":"2026-08-09T17:05:46.625Z","updatedAt":"2026-08-23T15:14:15.796Z","model":{"id":"cdcb0582-9fe1-4ae8-9ab2-968a54040a11","companyId":"8c8a9f0b-110b-4d16-aad1-20798e85da1b","modelName":"Autoware","slug":"autoware","description":"Autoware is the world's first open-source software stack for autonomous driving, built on ROS and maintained by TIER IV and the Autoware Foundation. It provides a full-stack AD system including perception, planning, and control, and is used by 200+ companies worldwide in applications ranging from robotaxis to autonomous buses and logistics trucks.","formFactor":"brain","industryVertical":null,"environment":null,"maturityStage":"commercial","lifecycleState":"active","supersededByModelId":null,"specs":{},"manufacturerSerial":null,"reviewStatus":"reviewed","sources":[{"url":"https://autoware.org/","label":"Autoware Foundation","title":"Autoware Foundation","mediaType":"article","sourceName":"Autoware Foundation"},{"url":"https://www.sumitomocorp.com/en/jp/news/topics/2025/group/20250127","label":"Sumitomo Corporation","title":"Autonomous Bus Trial Launch in Kumamoto City","mediaType":"article","sourceName":"Sumitomo Corporation"},{"url":"https://tier4.co.jp/en/updates/press-release/20241031-01","label":"TIER IV","title":"TIER IV AI Pilot system certified for Level 4 autonomous driving","mediaType":"article","sourceName":"TIER IV"}],"aliases":[],"collisionRisk":"low","reviewNote":null,"manufacturerTermForTeleop":null,"keyFacts":[{"label":"Type","value":"Open-source autonomous driving software stack built on ROS."},{"label":"Maintainers","value":"TIER IV and the Autoware Foundation."},{"label":"Adoption (company-claimed)","value":"Used by 200+ companies worldwide."},{"label":"Japan L4 bus services (company-claimed)","value":"Powers Level 4 autonomous bus services in Japan, including Shiojiri, Nagano and Kumamoto."},{"label":"Origin","value":"Originally released by Nagoya University in 2015 as the first open-source AD stack."}],"createdAt":"2026-08-09T17:05:18.937Z","updatedAt":"2026-10-12T21:54:43.373Z","unitsInFieldClaimed":null,"unitsInFieldVerified":null,"unitsManufacturedClaimed":null,"unitsManufacturedVerified":null,"unitsAsOf":null,"unitsSource":null,"salesModel":null,"priceUndisclosedSince":null,"autonomyClass":null,"autonomyStatement":null,"autonomyStatementSource":null,"demoForensics":null,"exportControlClass":null,"minCommitment":null,"warrantyTerms":null,"serviceModel":null,"productionRateClaimed":null,"productionRateEvidenced":null,"teleopRatioDisclosed":null,"interventionRateDisclosed":null},"deployment":{"id":"2e5b5989-03d1-44fc-a4e5-d0f023415544","modelId":"cdcb0582-9fe1-4ae8-9ab2-968a54040a11","versionId":null,"locationId":"e2e132f3-0fbf-4e31-b53d-57277160020c","operatorId":"8c8a9f0b-110b-4d16-aad1-20798e85da1b","ownerId":null,"slug":"autoware-shin-tomei-expressway-japan","status":"pilot","firstSeen":"2025-04-27T00:00:00.000Z","statusChangeReason":null,"contractType":null,"pilotOutcome":null,"endedAt":null,"unitsOnSite":null,"tasksPerformed":["delivery"],"shiftStructure":null,"hoursPerDay":16,"siteType":"airport","operatorConfirmed":null,"humanSupervisionOnsite":null,"locationPrecisionTier":"verified_coordinates","deploymentScale":"small_2_10","siteEnvironment":"outdoor","operatorType":null,"sourceQualityTier":2,"manufacturerSerial":null,"reviewStatus":"reviewed","sources":[{"url":"https://www.prnewswire.com/news-releases/tier-iv-accelerates-the-deployment-of-autonomous-trucks-following-completion-of-japanese-government-initiative-302437976.html","label":"TIER IV accelerates the deployment of autonomous trucks","title":"TIER IV accelerates the deployment of autonomous trucks","mediaType":"article","sourceName":"PR Newswire","publishedAt":"2025-04-27"}],"notes":"Autonomous truck test runs on a priority lane for autonomous vehicles on the Shin-Tomei Expressway, using Isuzu Motors and Mitsubishi Fuso trucks with TIER IV autonomous driving system. Part of a METI-led initiative. Logistics operators Yamato Multi Charter and Suzuyo Cargo-Net participated.","keyFacts":[{"label":"Vehicle makers","value":"Isuzu Motors, Mitsubishi Fuso"},{"label":"Operators","value":"Yamato Multi Charter, Suzuyo Cargo-Net"}],"reviewNote":null,"exposureHours":null,"deploymentMilesEstimate":null,"exposureBasis":null,"customerSegment":"logistics","scaleTier":"pilot_lt10","contractValueUsd":null,"contractValueBasis":null,"customerCompanyId":null,"customerExternalName":null,"createdAt":"2026-08-09T17:07:15.996Z","updatedAt":"2026-08-21T17:08:40.584Z"},"company":null,"derived":{"status":"active"},"sources":[{"id":"b23c9144-b88d-4c46-8c89-98598dc69456","incidentId":"bf459530-b666-415c-8b4e-576d1ce1ca85","url":"https://newsdig.tbs.co.jp/articles/-/1699474","label":null,"publishedAt":"2025-01-30T00:00:00.000Z","notes":null,"title":"Kumamoto autonomous bus rear-ended during test run","sourceName":"TBS NEWS DIG","mediaType":"article","videoId":null,"channel":null,"durationSec":null,"timestampSec":null,"createdAt":"2026-09-29T19:11:33.346Z","updatedAt":"2026-09-29T19:11:33.346Z"},{"id":"7f0fe978-1411-4b7b-99db-73d35b53cc05","incidentId":"bf459530-b666-415c-8b4e-576d1ce1ca85","url":"https://www.sumitomocorp.com/en/easia/news/important/group/20250317","label":"Sumitomo Corporation","publishedAt":"2025-03-17T00:00:00.000Z","notes":null,"title":null,"sourceName":"Sumitomo Corporation","mediaType":"article","videoId":null,"channel":null,"durationSec":null,"timestampSec":null,"createdAt":"2026-08-09T17:05:46.625Z","updatedAt":"2026-08-09T17:05:46.625Z"},{"id":"78e494e0-cf4d-48ea-aa9e-2b1b0c3d5ee0","incidentId":"bf459530-b666-415c-8b4e-576d1ce1ca85","url":"https://www.sumitomocorp.com/en/jp/news/important/group/20250317","label":null,"publishedAt":"2025-03-17T00:00:00.000Z","notes":null,"title":"Autonomous Bus Trial Launch in Kumamoto City (Update)","sourceName":"Sumitomo Corporation","mediaType":"article","videoId":null,"channel":null,"durationSec":null,"timestampSec":null,"createdAt":"2026-09-29T19:11:32.422Z","updatedAt":"2026-09-29T19:11:32.422Z"}],"responses":[],"statusEvents":[{"id":"faff0bb9-216f-4548-bd33-e5f71e084637","incidentId":"bf459530-b666-415c-8b4e-576d1ce1ca85","status":"active","reason":null,"source":"agent:recon","effectiveAt":"2026-08-09T17:05:47.788Z","createdAt":"2026-08-09T17:05:47.788Z"}],"jsonLd":{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://registry.deploy.report/incidents/tier-iv-kumamoto-bus-rear-ended-2025-01","url":"https://registry.deploy.report/incidents/tier-iv-kumamoto-bus-rear-ended-2025-01","headline":"TIER IV autonomous bus rear-ended by public bus during Kumamoto test run","description":"On January 30, 2025, a TIER IV Minibus 2.0 autonomous bus operating under a trial in Kumamoto City was rear-ended by a following public bus at the Umayabashi intersection near Kumamoto City Hall. The autonomous bus was operating normally at the time. No injuries were reported among the 4 passengers on the autonomous bus or 15 on the following vehicle. The incident caused damage requiring repairs and delayed the public trial launch from February 10 to March 21, 2025. Sensors and autonomous driving system were confirmed unaffected.","identifier":"bf459530-b666-415c-8b4e-576d1ce1ca85","datePublished":"2025-01-30T06:34:00.000Z","articleSection":"collision","publisher":{"@id":"https://deploy.report/#organization"},"author":{"@id":"https://deploy.report/#organization"}},"framework_metadata":{"framework_schema_version":"0.1.0","verification_status":"verified","maturity_stage":null,"lifecycle_state":null,"architectural_position":{"cohort":null,"sub_cohorts":[]},"within_cohort_verified_vs_claimed_pair":null,"cap_flags":[],"verification_depth":{"sources_count":3,"primary_source_types":[]}}}