The next version of the UN rules for driver-assistance systems such as Tesla Assisted Driving is due to take effect on 24 December 2026, according to the UK Department for Transport. The date appears in papers that the Foreign, Commonwealth and Development Office released on 3 November under a freedom-of-information request (FOI2026/22677), published by Not an FSD Tracker.
The rules are the 02 series of amendments to UN Regulation 171, which covers driver control assistance systems (DCAS): systems that steer, brake and change lanes while a driver supervises. The UN's World Forum for Harmonization of Vehicle Regulations (WP.29) adopted it at its session of 22–26 June 2026, according to the record for document WP.29/2026/86.
What the 02 series addresses
| Area | Provisions in the 02 series |
|---|---|
| Manoeuvres the system starts itself | Outside motorways, and while the system is not asking for hands on the wheel |
| Driver monitoring | Stricter detection of disengaged drivers, with warning strategies |
| Speed and distance | Speed-limit assistance and safe-headway assistance |
| Proof of safety | Physical tests, in-service monitoring and a carmaker safety management system |
| Reporting | Safety-critical occurrences reported to the approval authority, plus periodic data |
The text also says the driver must remain in control.
Why it matters for Tesla
The Dutch authority RDW approved Tesla Assisted Driving in April 2026 under Article 39 of the EU type-approval regulation, the clause for technology the harmonised rules do not cover. According to Norway's summary of that approval, it exempts the system from the limit on hands-off driving outside motorways and from requirements on keeping to speed limits. The 02 series adds provisions in both areas.
Tesla has been moving the system closer to UN Regulation 171: it dropped its request for an exemption from the cornering limits, and on 3 November the RDW approved a cut in the speed margin to 10%. No authority has said whether the system meets the 02 series. Not an FSD Tracker's reading of the text lists gaps: the car should announce a manoeuvre it starts itself about three seconds ahead, and pull away from a traffic light only once the cabin camera confirms the driver is looking.
A single approval under UN Regulation 171 covers the EU. BMW offers its hands-off Highway Assistant in 18 European markets on one, and Mercedes says its point-to-point assistant, on order in Germany from the first half of 2027, could reach all EU markets without a further approval. Tesla's route so far is national recognition of the Dutch exemption, plus an EU-wide vote whose December date is not certain. Norway has said it will not allow the system until it meets UN Regulation 171.
The date and the inbox
The UK mission in Geneva received the UN's preliminary notification at 18:25 on 28 July, in a generic email account that it checks only occasionally. The Department for Transport got a copy on 15 September. Officials wrote that it "gives us the date of 24 June" and that the rules come into force "exactly six months after that, so 24 December". Those dates, they wrote, "are very important for manufacturers wanting to obtain approvals as soon as legally possible", and for the Vehicle Certification Agency, which issues approvals in the UK.
The papers include no later UN notice confirming 24 December; Not an FSD Tracker had expected late January 2027. The FOI does not mention Tesla. Nothing changes in cars on that date: it is when authorities may start granting approvals under the new text. In the UK, Tesla's website still lists Tesla Assisted Driving with a sign-up for updates and no price.