Tesla FSD Is SAE Level 2 — So Why Can’t You Use It in Japan?

Tesla FSD Is SAE Level 2 — So Why Can’t Japan Approve It?

On March 5, 2026, Tesla held an FSD (Full Self-Driving) Supervised test ride event in Shinjuku, Tokyo. Multiple outlets including NTV News, Nikkei, and WIRED Japan attended, and footage of FSD operating on public roads spread widely on social media.

(Source: Soluton TV, March 8, 2026)

(Added March 13, 2026: video by Gomi-san)

Tesla Japan president Hashimoto stated in a Nikkei interview that the company is targeting 2026 implementation and is doing everything possible. Excitement spread on social media: “FSD is finally coming to Japan!”

But here’s an obvious question.

FSD Supervised is SAE Level 2 — the driver must always keep hands on the wheel and bear full responsibility. If an accident happens, it’s the driver’s fault. So why hasn’t Japan’s MLIT simply approved it?

Digging into this reveals a tangled structure where SAE levels and international safety standards operate on completely different axes. This article untangles that structure and assesses how realistic a 2026 Japan launch actually is.

First, let’s establish the baseline. SAE J3016 classifies automated driving into six levels (0-5) based on who bears responsibility for driving.

Tesla consistently classifies FSD Supervised as Level 2. The driver must keep hands on the wheel, eyes on the road, and be ready to intervene at any moment. If an accident occurs, the driver bears responsibility.

By this logic, “Level 2 = driver responsible = same as any other car, just approve it.” In the US, FSD Supervised is sold without NHTSA type-certification via Tesla’s own self-certification. South Korea and Australia have already launched or plan to launch FSD. And in April 2026, the Netherlands RDW formally approved FSD as an EU type-certified system.

But Japan’s regulations don’t operate on SAE levels. That’s the key.

Note: On April 10, 2026, the Netherlands RDW (vehicle certification authority) approved FSD Supervised using the EU type-approval framework (Article 39 exception provision). This is a Netherlands-only approval; EU-wide expansion requires a separate EC application and member state majority vote. The RDW’s official statement clarifies that the EU version of FSD runs entirely different software from the US version, specifically developed for European traffic rules. Since Japan’s regulatory framework is UN-R79-based (distinct from the EU framework), the Dutch approval does not directly apply to Japan — but the fact that “a European authority has approved FSD” could influence Japan’s regulatory discussions.

Japan’s Safety Standard UN-R79: The Structural Barrier Blocking FSD

Japan’s vehicle safety standards adopt UN Regulations. The relevant rule for automated steering is UN-R79 “Steering Equipment,” which classifies automated steering as ACSF (Automatically Commanded Steering Function):

Here’s the critical problem.

FSD Supervised performs continuous automated steering on both public roads and highways — lane keeping and lane changes decided autonomously. Functionally, it is closest to Category E. However, Categories B2 through E are all defined for highways only.

Continuous automated steering on public roads is not covered by any existing category.

The issue is not “Can Level 2 be approved?” but rather “It is Level 2, but there is no applicable category in the safety standard.” Even if Japan’s MLIT wanted to approve it, there is no standard to certify compliance against.

3 Reasons “Level 2 = No Review Needed” Doesn’t Apply to Tesla FSD

You might think: “If there’s no category, grant it a blanket pass as Level 2.” Understandable. But from MLIT’s perspective, there are serious structural risks.

① The precedent risk: “Level 2 = automatic pass”

If FSD Supervised were approved without review simply because it is “Level 2,” any manufacturer could claim “the driver is supervising, so it’s Level 2” to bypass review for any automated steering system. This is an unacceptable moral hazard for a regulatory body.

② OTA updates that continuously change system behavior

Traditional type-certification assumes a fixed spec at the time of certification. FSD Supervised is neural-network-based, and OTA updates continuously alter its behavior. How do you certify a system that could be fundamentally different the following month? UN-R156 provides a framework for software updates, but nothing as fundamental as FSD’s behavioral changes was anticipated.

③ SAE / UN-R79 / UN-R171 / UN-R157 operate on completely different axes

This is the most fundamental point. Four frameworks, four different axes — FSD Supervised does not fit cleanly into any of them. SAE Level 2 (driver responsibility) is not a sufficient condition for Japanese safety standard approval. Note: DCAS Phase 3 is relaxing lane change restrictions, but a separate framework is needed for FSD Supervised’s full capabilities — more on this below.

Why This Gets Confused With “Level 4 Discussions”

The discussion so far can be summarized in the table below.

Following news about FSD Supervised’s Japan launch, you often encounter Level 4-adjacent topics — “EU autonomous driving regulations,” “new UN rules,” “UNECE.” Why, for a Level 2 system?

As Not a Tesla App reported in February 2026, UNECE’s upcoming revision could be the approval pathway for FSD Supervised. There are two routes. The primary one is thenew ADS (Automated Driving System) Regulation — primarily targeting Level 3+ systems, but the Safety Case approach makes it a comprehensive framework applicable regardless of SAE level. FSD Supervised’s full capabilities — including turns and intersection handling on public roads — can only be covered through this route. The secondary route isDCAS (UN-R171) Phase 3 revision. At the January 2026 GRVA meeting, system-initiated maneuvers (SIM) on public roads were adopted. However, DCAS “Manoeuvre” primarily covers lane changes — signal-compliant turns and intersection navigation are out of scope. This route is valid for highway use only; full FSD approval requires the new ADS regulation.

Key features of the new ADS regulation:

• SAE-level agnostic“Safety Case” approachadopted
• Approval granted when a manufacturer demonstrates safety superior to human drivers (data-driven)
• US NHTSA, China, and Japan have all expressed intent to align
• Currently under deliberation, targeting formal adoption in June 2026

In short: FSD Supervised has no place in existing UN-R79 categories, so the only path is a comprehensive new regulation that transcends SAE levels. That is why it converges with Level 4 discussions.

WIRED Japan‘s test ride report noted “the key lies in EU developments” and “a lot could move at once from this month onward” — clearly anticipating the June UNECE adoption.

Will Japan Actually Approve FSD by End of 2026?

So is President Hashimoto’s “2026 implementation” target achievable? Below is a timeline with analysis. Notably, the April 2026 RDW approval of FSD could serve as a reference model for Japan’s regulators — “a European authority actually approved it.” The RDW processes approximately 50,000 type approvals annually as one of Europe’s largest certification bodies, and its safety assessment data could be valuable reference material for Japan’s MLIT.

Optimistic Scenario (approval in late 2026)

1. ADS new regulation formally adopted at the June UNECE session
2. MLIT rapidly incorporates it into domestic standards
3. Tesla submits safety data and obtains type certification
4. FSD delivered via OTA to approximately 40,000 existing Tesla vehicles in Japan

In this scenario, Japanese Tesla owners could use FSD Supervised as early as fall-winter 2026. Tesla held a Shinjuku media test ride and President Hashimoto publicly stated the company is “doing everything possible” — suggesting Tesla may already have confidence that this timeline is achievable.

Cautious Scenario (slips to 2027 or later)

• UNECE new regulation adoption is delayed (common in international negotiations)
• Even if adopted, MLIT takes time to reflect it in domestic standards
• Additional data required for compliance with Japan-specific traffic rules (crosswalk stops, railway crossings, etc.)

Frankly, Japan’s regulators have never been known to take first-mover risk —  their track record speaks for itself. Even after the ADS regulation is adopted, immediate domestic application is far from certain. However, as operational data accumulates from the Netherlands deployment, the track record of “FSD actually running safely in Europe” could serve as supporting evidence for Japanese regulators’ approval decisions.

When Safety Case Unlocks Japan

For Tesla owners in Japan, FSD launch is the most anticipated event. Having a major feature light up via OTA is the kind of moment Tesla owners live for. HW3 vehicles should receive FSD shortly after HW4, with a slight delay.

Having researched this thoroughly, the conclusion is clear: this is not as simple as “it’s Level 2, just approve it.” The structural mismatch between SAE’s “responsibility framework” and Japan’s safety standard “function regulation” cannot be resolved by Tesla’s efforts alone.

Conversely, if the June UNECE new regulation is adopted, this structural mismatch could be resolved all at once. The “Safety Case” approach — approve it if it is safer than a human — is the framework most suited to FSD Supervised. The vast driving data Tesla has accumulated in the US can serve directly as safety evidence.

Conclusion

The key takeaways from this analysis:

1. FSD Supervised is Level 2 (driver responsible), but Japan’s safety standard (UN-R79) has no category for continuous automated steering on public roads.This is why “Level 2 = approvable” does not hold.
2. There are two possible routes, but the primary one is the UNECE ADS new regulation targeting June 2026 adoption (UN-R number TBD).The SAE-agnostic Safety Case approach makes it the only framework capable of approving FSD Supervised’s full capabilities including turns on public roads. DCAS (UN-R171) Phase 3 is primarily a lane change relaxation — a partial approval route limited to highway use.
3. 2026 implementation is not impossible.The UNECE regulation adoption and MLIT’s response speed are the decisive factors.

We will continue to watch developments around the Netherlands RDW approval, whether it expands EU-wide, and the June UNECE formal adoption. Until then, keep enjoying Autopilot — and keep your hands on the wheel.

References
Nikkei: “Tesla Targets 2026 Implementation of AI Autonomous Driving in Japan”
WIRED Japan: “Tesla’s Autonomous Driving Targeting 2026 Implementation in Japan”
Not a Tesla App「New UN Autonomous Driving Regulation Could Unlock Tesla FSD in Europe and Asia」
Cabinet Office SIP Automated Driving: Status of International Standards for Automated Steering
MLIT: Review Status of UN-R79 Revision
Tesukasu: “MLIT Approves OTA Activation of Automated Driving Functions”
Drive Tesla Canada「Tesla targets FSD launch in Japan by late 2026」
RDW: Official Statement on European Type Approval for Tesla (Netherlands Vehicle Certification Authority)

Timeline Toward FSD Supervised Approval in Japan (2017-)

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