TIER IV, the Tokyo company behind the open-source Autoware autonomous-driving software, has been selected by Japan’s Ministry of Economy, Trade and Industry for a grant to run autonomous bus field tests in Saudi Arabia.
The selection, disclosed to the Tokyo Stock Exchange on 4 September, sits under METI’s “Global South” programme for large-scale demonstrations in non-ASEAN countries. TIER IV was one of nine successful applicants from sixteen.
What the TIER IV project involves
The plan has three parts. First, TIER IV will build autonomous buses for Saudi Arabia. It will work with a European automaker to integrate its system, using buses developed in Japan as a reference. Second, it will retrain an Autoware-based system on local data. The system must handle desert heat, sandstorms and right-hand traffic.
Testing starts in closed environments before moving to public roads. Third, it will work with local universities on STEM programmes and autonomous-driving competitions.
The schedule is long. TIER IV expects to build the buses and begin training AI models in 2027. Closed-area demonstrations follow in 2028, and local projects from 2029.
The number the English release leaves out
The English announcement does not mention money. TIER IV’s Tokyo Stock Exchange filing does. The company applied for 6,000 million yen — about US$40 million — of eligible expenditure at a two-thirds subsidy rate. Both figures are provisional, and the formal grant decision and final amount will be settled later.
Eligible costs cover machinery, vehicle construction, data collection and AI model training. TIER IV said the effect on its September 2026 financial year is immaterial.
Why Saudi Arabia
Saudi Vision 2030 targets making 15% of public transport autonomous by 2030, and 25% of logistics. Riyadh also hosts Expo 2030, which the company cites as a source of demand.
The Kingdom has been signing AV deals. SAPTCO and HOLON agreed in September 2025 to launch autonomous buses. The Transport General Authority granted its first autonomous-driving permit to WeRide in July 2025. The pilot runs in Riyadh and AlUla.
The bigger picture
TIER IV’s Autoware is the leading open-source framework for autonomous driving, hosted by the Autoware Foundation. The company holds Level 4 certifications in Japan and has been testing data-centric AI stacks in Tokyo, Pittsburgh and Munich.
The Saudi project is a test of whether an open-source AV stack can travel. Adapting it to a new climate, road rules and driving culture is the harder half of exporting autonomous technology. Feeding that data back into the model is the other half.
What to watch
Three things will show whether this becomes a business or a demonstration. Whether the timeline holds — closed-area tests in 2028, public roads from 2029. Whether the grant is formally awarded at the size the filing implies. And whether other Japanese AV firms follow TIER IV into the Gulf.
Editor’s Note
Sources: TIER IV’s release of 4 October 2026; TIER IV’s Tokyo Stock Exchange filing of 4 September 2026; METI’s selection notice for the FY2025 Global South co-creation subsidy; TIER IV corporate and product materials; the Autoware Foundation; and Saudi AV coverage from The National, SAPTCO, Arab News and Saudi mobility analysts. The grant figures, product plans and timelines are as stated by TIER IV or in its regulatory filing, and the grant is a selection rather than a final award. TechRecast has not independently verified them. This article is not investment advice.