Japan is making significant strides in autonomous driving technology implementation, with multiple prefectures conducting Level 4 trials aimed at addressing transportation challenges and positioning the country competitively in the global autonomous vehicle market.
The most notable trials include Aichi Prefecture’s urban arterial road service and highway testing on the Shin-Tomei Expressway, both achieving remarkable technical metrics while providing valuable operational insights for future nationwide implementation.
The commercialization of Level 4 autonomous driving is expected to bring about significant changes across various sectors beyond the automotive industry, including insurance, logistics, ICT, and urban planning.
This is anticipated to lead to structural changes throughout society, going beyond mere technological innovation. However, for these changes to be realized, several challenges need to be addressed, including technological maturity, regulatory and institutional frameworks, and social acceptance.
AI Strategica has taken a closer look at these transformations occurring in Japan.
Understanding Autonomous Driving Levels
Autonomous driving technology is categorized into levels from 0 to 5, with Level 4 representing a critical threshold toward fully autonomous transportation. At Level 2, which has become increasingly common in Japan, vehicles provide partial automation with systems handling acceleration, braking, and steering in specific conditions, though drivers must remain attentive and ready to take control.
Level 4, the focus of current advanced trials, represents full automation within specific operational domains without requiring human intervention.
Under defined conditions and geographic areas, Level 4 vehicles can operate without a driver, representing a significant advancement toward solving transportation challenges like driver shortages and improving mobility access.
Government Policy Framework
The Japanese government has established ambitious targets through its “Digital Garden City National Structure Comprehensive Strategy,” aiming to implement autonomous driving services in approximately 50 locations by 2025 and over 100 locations by 2027.
This policy framework reflects Japan’s commitment to addressing critical societal challenges through technological innovation.
According to a recent survey, 32 of Japan’s 47 prefectures (68%) are considering the introduction of Level 4 self-driving buses, highlighting the widespread recognition of autonomous driving’s potential to address the worsening driver shortage in the public transportation sector.
Aichi Prefecture’s Urban Arterial Road Service
Aichi Prefecture conducted a groundbreaking autonomous shuttle service connecting Nagoya Station and STATION Ai, Japan’s largest innovation hub, from November 2024 through March 2025. This represented Japan’s first implementation of regular autonomous vehicle operations on busy urban arterial roads.
The service utilized a modified Toyota Sienna hybrid minivan capable of reaching speeds up to 48 km/h to match actual traffic flow conditions. This initiative was led by NTT DOCOMO as the lead company in a consortium of seven firms, focusing on both technical capabilities and operational challenges in preparation for Level 4 implementation.
The trial achieved impressive technical metrics, with approximately a 90% autonomous driving rate (excluding manually designated driving sections) and a 99.9% signal recognition rate.
The project continuously incorporated improvements to autonomous driving technology based on operational data.
Passenger data collected through February 2025 showed 1,166 passengers (excluding test rides by related parties) with approximately 80% male ridership and 70% from within the prefecture. Age distribution was relatively balanced, with the largest representation in the 30-40 age range. Importantly, about 95% of passengers reported positive satisfaction with the experience.
Highway Testing on Shin-Tomei Expressway
Advancing beyond urban environments, high-speed highway testing is making significant progress with driverless truck Level 4 testing being conducted on approximately 100km of the Shin-Tomei Expressway between Suruga Bay Numazu SA and Hamamatsu SA since March 2025. This initiative aims for social implementation by fiscal 2026.
The testing involves Japan’s major truck manufacturers, including Isuzu Motors, Hino Motors, Mitsubishi Fuso, and UD Trucks, working in collaboration with the Ministry of Economy, Trade, and Industry (METI) and the Ministry of Land, Infrastructure, and Tourism (MLIT). The tests are being conducted in designated priority lanes between 10 p.m. and 5 a.m. on weekdays.
This project specifically targets the growing shortage of truck drivers in Japan’s logistics industry. The tests are verifying various critical functions including automatic departure/arrival systems, emergency braking capabilities, integration with roadside infrastructure information systems, and remote monitoring protocols.
Timeline of Key Level 4 Autonomous Driving Developments in Japan
| Date | Location | Initiative | Key Features | Status |
|---|---|---|---|---|
| May 2022 | Eiheiji Town, Fukui Prefecture | ZEN drive | First approved Level 4 system; 7-passenger vehicle on 2km temple route | Operational for tourists on weekends and holidays |
| February 2024 | Constant Ota City, Ibaraki | EVO electric shuttle bus | Level 4-capable vehicle operating at Level 2; 10 passengers at 18 km/h | Regular operation with onboard operator |
| Jan-Feb 2025 | Shiojiri City, Nagano | Public road testing | Mixed pedestrian/vehicle environment; speeds up to 35 km/h; using “AI Pilot” system | Completed verification testing |
| Nov 2024-Mar 2025 | Nagoya, Aichi Prefecture | Urban arterial road service | First regular operation on busy urban roads; 90% autonomous rate; 99.9% signal recognition | Completed, 1,166 passengers served |
| March 2025-Present | Shin-Tomei Expressway | Truck testing | 100km highway section; priority lane testing; major truck manufacturers | Ongoing, targeting 2026 implementation |
| By end of 2027 | Tokyo (Bay Area/West Shinjuku) | Toyota and TIER IV service validation | Metropolitan implementation in designated promotion zones | In development |
STATION Ai: A Hub for Innovation and Mobility Technologies
STATION Ai, which served as one endpoint for Aichi Prefecture’s autonomous shuttle service, opened in October 2024 as Japan’s largest startup support hub spanning 23,000 square meters. It hosts over 200 partner companies and 500 startups and is recognized by Japan’s Cabinet Office as part of the “Startup City Project Japan”.
The facility represents a critical nexus between Aichi Prefecture’s traditional manufacturing strengths, particularly in automotive industries, and emerging technologies from startups. As stated by Aichi governor Hideaki Omura, STATION Ai provides a unique space “for startups and partners to collaborate under one roof”.
Former Prime Minister Fumio Kishida highlighted STATION Ai’s role in Japan’s five-year startup plan that began in 2022, expressing hope that “Aichi’s manufacturing strength and startup energy would unite to create global unicorns”.
Technical Achievements and Operational Insights
The Aichi Prefecture trial yielded valuable technical performance data, with its 90% autonomous driving rate and 99.9% signal recognition accuracy demonstrating the impressive capabilities of current autonomous systems while highlighting areas requiring further refinement.
The trial intentionally established rules prohibiting passengers from speaking to the safety driver, simulating future driverless operations. This approach allowed researchers to document the frequency and nature of passenger queries, providing insights into operational requirements for fully autonomous services.
As noted by Aichi Prefecture officials: “Through challenging high-difficulty routes in high-traffic urban areas and main arterial roads, mismatches between current rules and the driving environment have become apparent.
By carefully coordinating with stakeholders, we’re finding solutions and gradually improving regional acceptance of autonomous driving”.
Public-Private Partnership Model
Japan’s approach to autonomous driving implementation highlights a strategic public-private partnership model. Government entities provide the policy framework, funding, and regulatory support, while private companies contribute technological expertise, operational capabilities, and commercial perspectives.
This collaborative approach addresses both competitive and cooperative aspects of technology development. As noted by Aichi Prefecture officials, “Each company faces common challenges that are difficult to solve individually. By positioning these as cooperative domains and having the prefecture proactively conduct verification tests to identify and address issues, we support the smooth development of private business in competitive domains”.
Implications for Japan’s Transportation Future
The expansion of Level 4 autonomous driving trials across Japan carries profound implications for the nation’s transportation ecosystem, industrial competitiveness, and social welfare. These extend beyond technological achievement to impact economic structures, urban planning, and quality of life.
Japan’s aging population and acute driver shortages create urgent transportation challenges, particularly in rural areas where public transit options are diminishing.
Autonomous driving technologies offer potential solutions to maintain mobility services while addressing workforce limitations.
Many private bus operators have reduced or eliminated routes due to driver shortages, underscoring the critical timing of these technological advancements.
For Japan’s automotive industry, autonomous driving represents both challenge and opportunity. As noted by Aichi Prefecture officials, “Self-driving technology increases the importance of software, semiconductors, and sensors, potentially transforming the structure of the automotive industry significantly”. This transformation requires adaptation from traditional manufacturers while creating opportunities for new entrants and cross-industry collaboration.
The strategic public-private partnership model employed in these trials provides a template for technology implementation that balances national policy objectives with commercial viability.
By addressing cooperative challenges collectively while preserving competitive differentiation, this approach accelerates practical implementation while supporting industrial policy goals.
As these trials advance toward commercial implementation in 2026-2027, Japan positions itself to demonstrate a uniquely Japanese approach to autonomous transportation—one that emphasizes safety, reliability, and social benefit while maintaining industrial competitiveness in a rapidly evolving global market.
This model could ultimately serve as a reference for other nations facing similar transportation challenges with aging populations and driver shortages, particularly in developed economies with strong automotive manufacturing traditions.
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