GSR2: FAQs for N and O Vehicle Classifications
Adopted in 2019, the General Safety Regulation 2 (GSR2 — EU 2019/2144) came into force on 5 January 2020, replacing Regulation (EC) 661/2009. Its requirements are being phased in from 6 July 2022 onwards, prioritising road safety with stricter technical standards and advanced driver assistance systems (ADAS) for vehicles in categories N and O.
Important for UK readers: GSR2 applies to EU Whole Vehicle Type Approval (WVTA). Great Britain has not yet mandated these post-Brexit provisions for GB Type Approval (NSSTA/IVA), although this may change. Northern Ireland applies GSR2 under the NI Protocol.
Understanding GSR2 for N and O
- Enhanced safety features: GSR2 mandates or enables a range of safety systems across N and O vehicle categories, from collision prevention to driver-attention monitoring.
- Cost considerations: Upfront costs may increase, but long-term savings can arise from fewer incidents, operational efficiencies and potentially lower insurance premiums.
What matters for O3 and O4 trailers
For most O3/O4 trailers, only a subset of GSR2 items will apply unless specific electronic systems are fitted. Two common touchpoints are:
- Tyre Pressure Monitoring (TPMS) — mandated on O3 and O4 within the relevant phase dates.
- Cybersecurity (UN R155) — applies where trailers include electronic control units (ECUs), telematics or connected systems that could be vulnerable to unauthorised access. If no such systems are present, UN R155 generally will not bite.
Major trailer ECU suppliers (e.g. ZF/WABCO, Knorr-Bremse, Haldex) are releasing updated ECUs designed with GSR2/UN R155 compliance in mind. Fitting these newer units can future-proof EU/NI type-approval pathways and avoid split hardware strategies across markets.
Key GSR2 Bodywork & Safety Features for N and O Classification Vehicles
The table below excludes items already in force from 6 July 2022 (Phase A).
| Feature | Regulation | N2 (3.5–12 t) | N3 (>12 t) | O3 (3.5–10 t) | O4 (>10 t) | Notes |
|---|---|---|---|---|---|---|
| Pedestrian & cyclist collision warning (incl. MOIS) | UN R159 | B | B | Detects and warns of potential collisions with pedestrians/cyclists. | ||
| Blind Spot Information System (BLIS) | UN R151 | B | B | Alerts drivers to vehicles in blind spots. | ||
| Reversing detection | UN R158 | B | B | Cameras and/or sensors to improve reversing visibility. | ||
| Heavy-duty vehicle direct vision | — | D | D | |||
| Tyre Pressure Monitoring (TPMS) | UN R141 | B | B | B | B | Improves safety and efficiency by monitoring under-inflation. |
| Protection against cyberattacks | UN R155 | B | B | Applies where ECUs/telematics are present and in scope. | ||
| Intelligent Speed Assist (ISA) | EU 2021/1958 | B | B | Provides feedback/warnings when exceeding speed limits. | ||
| Emergency stop signal | UN R48 | B | B | Flashing brake lights to warn following traffic under heavy braking. | ||
| Alcohol interlock installation facilitation | EU 2021/1243 | B | B | Standardised interface for aftermarket devices. | ||
| Driver drowsiness & attention warning | EU 2021/1341 | B | B | Detects fatigue/distraction and prompts alerts. | ||
| Advanced driver distraction warning | EU 2021/1341 | C | C | Warns when the driver is not focused on the traffic situation. | ||
| Event data recorders (EDRs) | EU 2022/545 / UN R160 | D | D | Records crash data to aid investigation and safety improvement. | ||
| Platooning | — | B(1) | B(1) | Compliance required if fitted: linked convoys via automation. | ||
| Driver availability monitoring system | UN R157 | B(5) | B(5) | Checks readiness to take over from automated functions. | ||
| Systems replacing driver control | UN R157 | B(5) | B(5) | Includes signalling, steering, accelerating and braking. | ||
| Systems providing state/surroundings information | UN R157 | B(5) | B(5) | Vehicle and environment perception for automation. | ||
| Systems providing safety information to others | — | B(5) | B(5) | External communication from automated vehicles. |
Dates of Enforcement
- A: 6 July 2022 — applies to new vehicle types.
- B: 7 July 2024 — applies to all vehicles in scope.
- C: 7 January 2026 — new vehicle types; 7 July 2026 — all vehicles.
- D: 7 January 2029 — applies to all vehicles (some elements for new types may apply earlier).
Notes
- (1) Compliance required if the feature is fitted.
- (5) Compliance required in the case of automated vehicles.
GB vs EU Applicability
- EU WVTA: GSR2 is applicable on the dates above.
- Great Britain: Post-Brexit GSR2 items are not yet mandated for GB Type Approval (NSSTA/IVA). The DfT may, however, choose to align in future.
- Northern Ireland: Vehicles under NI Type Approval must meet EU GSR2 requirements.
This overview is for general guidance. For specific builds and approval pathways, consult your approval authority and relevant OEM/ECU supplier documentation.
