Incident 1825: Autonomous a2z ROii Bus Struck Roadside Stone Wall During Passenger Trial in Toyooka, Japan

Responded

Description: A Level 2 autonomous ROii bus developed by South Korea's Autonomous a2z struck a roadside stone wall in Toyooka, Hyogo Prefecture, Japan, after moving left in response to an oncoming large vehicle. The bus was carrying six passengers and two crew members, none of whom was injured. The city suspended the demonstration pending safety checks and an investigation into the cause.

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Alleged: Autonomous a2z Corporation and Automated driving system developers developed an AI system deployed by Toyooka City , Zentan Bus Co., Ltd. , Automated driving system deployers and Autonomous vehicle fleet operators, which harmed Bus passengers , Passengers , Public transit passengers , Road users and Public safety.

Alleged implicated AI systems: ROii autonomous bus , Automated driving systems and Autonomous vehicle decision-making system

Incident Stats

Incident ID

1825

Report Count

Incident Date

2026-11-09

Editors

Daniel Atherton

Incident Reports

Reports Timeline

Regarding the suspension of the "Toyooka City Autonomous Driving Bus Demonstration Operation"

city.toyooka.lg.jp

Kanematsu, Zentan Bus, Sompo Japan, and KDDI collaborate to begin a pilot operation of an autonomous bus in Kinosaki Onsen, Toyooka City. This initiative aims to combine the expertise of each party to promote social implementation and solve transportation challenges in the hot spring resort area.

kanematsu.co.jp

Kanematsu, Zentan Bus, Sompo Japan, and KDDI Collaborate to Launch an Autonomous Bus Demonstration in Kinosaki Onsen, Toyooka City

kanematsu.co.jp

Free trial rides on self-driving buses in the Hyogo Kinosaki Onsen area; 3 trips daily on weekdays from November 9th to December 4th.

n.yam.com

city.toyooka.lg.jp · 2026

AI Translated

Toyooka City post-incident response

The autonomous bus service, which began today, will be suspended as follows:

1. Reason for Suspension

An accident occurred in Kinosaki-cho, Toyooka City, involving a collision between the autonomous bus and a stone wall.

To ensure safe oper…

kanematsu.co.jp · 2026

AI Translated

Toyooka City, Hyogo Prefecture (Mayor: Yuji Monma, hereinafter "Toyooka City"), Kanematsu Corporation (Head Office: Chiyoda-ku, Tokyo; President and CEO: Yoshiya Miyabe, hereinafter "Kanematsu"), Zentan Bus Co., Ltd. (Head Office: Yabu City…

kanematsu.co.jp · 2026

Toyooka City, Hyogo Prefecture (“Toyooka City”); Kanematsu Corporation (“Kanematsu”); Zentan Bus Co., Ltd. (“Zentan Bus”); Sompo Japan Insurance Inc. (“Sompo Japan”); KDDI CORPORATION (“KDDI”); and KDDI Smart Mobility Inc. (“KDDI Smart Mobi…

n.yam.com · 2026

AI Translated

Six companies—Toyooka City, Hyogo Prefecture, along with Kanematsu, Zendan Bus, Sompo Japan, KDDI, and KDDI Smart Mobile—will conduct a pilot test of autonomous buses in the Kinosaki Onsen area starting November 9, 2026, until December 4 (F…

Variants

A "variant" is an AI incident similar to a known case—it has the same causes, harms, and AI system. Instead of listing it separately, we group it under the first reported incident. Unlike other incidents, variants do not need to have been reported outside the AIID. Learn more from the research paper.

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Incident Date:

2026-11-09

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