Agenda for the 48th session of the Subgroup on EDR, a hybrid meeting scheduled for 15-16 September 2026 in Berlin. The agenda includes a final review of and potential amendments to official documents to GRSG regarding UN R160 and UN R169, discussion of the need for Step 3 and inventory of potential items for Step 3 workstream with presentations by IWG delegations expected, EDR for ADS, and a list of action items and schedule of future conference call meetings.

Proposal to amend definitions, recording triggering conditions, time zero establishment, crash test requirements, post-crash acceleration measurement, and data recording parameters:

• Amend definitions of automatically commanded steering function categories A, B1, B2, C, D, and E to clarify they are not part of a DCAS,
• Amend definition of “End of event time” to specify conditions for planar and other events,
• Amend definitions of “Engine throttle, percent full,” “Service brake status,” “Time interval between current event and previous event,” “Volatile memory,” and “VRU secondary safety system,”,
• Delete definition of “If recorded,”,
• Amend definition of “Non-volatile memory” to remove redundant text,
• Renumber “Accident Emergency Call System” from paragraph 2.2. to paragraph 2.25.,
• Insert new definitions for rollover protection system, AEBS, trigger activated, pre-event synchronization timer, blind spot monitoring system, emergency stop signal, turn signal, ACPE, ADDW, DCAS, and DDAW,
• Amend paragraph 5.3.1. on conditions for triggering recording to distinguish planar/VRU/rollover events from AEBS events and clarify that vehicles not fitted with certain systems are not required to trigger recording according to those paragraphs,
• Restructure paragraph 5.3.3. on time zero establishment to separately address planar/VRU/rollover events and AEBS events,
• Amend paragraph 5.4.3. to clarify crash test requirements,
• Amend paragraph 6.1. to clarify measurement of post-crash acceleration,
• Insert transitional provisions in paragraphs 12.12. through 12.16. establishing that as from entry into force no Contracting Party shall refuse to grant type-approvals under the 03 series of amendments, as from 1 September 2031/2029 Contracting Parties shall not be obliged to accept approvals to preceding series first issued after that date, until 1 September 2033 Contracting Parties shall continue to accept approvals issued according to preceding series first issued before 1 September 2031/2029, Contracting Parties may grant approvals according to any preceding series, and Contracting Parties shall continue to grant extensions of existing approvals to any preceding series,
• Amend Annex 1 to correct typo,
• Amend Annex 4 Table 1 to separate engine throttle and accelerator pedal data elements, increase recording intervals for rollover data, adjust recording intervals for AEBS events to −2.5 to 2.5 seconds, increase sample rates to 10 Hz for multiple data elements, add data elements for pre-event synchronization timer, trigger activated, ACPE status, ADDW status and time since warning, blind spot monitoring system status, turn signal status, DCAS status and driver monitoring system data, DDAW status and time since warning, and emergency stop signal status, and add time to collision data element for AEBS events.

Proposal to amend definitions 2.22 and 2.49 to modify the descriptions of non-volatile and volatile memory, and amend para. 5.3.1.2. to permit the EDR to write captured data from threshold criterion (a) in volatile memory only, with data from volatile memory written to non-volatile memory if any other trigger of para. 5.3.1. occurs or the vehicle master control switch is deactivated. The modification reduces memory wear in vehicles characterized by frequent stops.

France requests that the implementation date for all new vehicles be extended until September 2034 rather than the currently proposed date.

The agenda includes discussion of EDR Step 2 documents and EDR for ADS documents, review of action items and schedule of future meetings, and adjournment. Future meetings are scheduled for September 8, 2026, and October 6-8, 2026.

Proposal to amend UN R160:

• Amend definitions 2.8., 2.10., and 2.11. to clarify that automatically commanded steering function categories B2, D, and E are not part of a DCAS
• Delete definition 2.25.
• Amend definition 2.35. to simplify non-volatile memory
• Amend para. 2.45. to change service brake terminology
• Amend para. 2.51. to clarify time interval between events
• Amend para. 2.65. to abbreviate vulnerable road user
• Insert new definitions 2.71.–2.83. for rollover protection system, advanced emergency braking system, trigger activated, pre-event synchronization timer, blind spot monitoring system, emergency stop signal, turn signal, acceleration control for pedal error, advanced driver distraction warning system, driver drowsiness and attention warning system, driver control assistance system, and time to collision
• Restructure para. 5.3.1. to distinguish planar, VRU, and rollover events from AEBS events with specified triggers
• Amend para. 5.3.2. to clarify data locking conditions
• Restructure para. 5.3.3. to establish time zero for planar, VRU, rollover, and AEBS events
• Amend para. 5.4.3. to specify side and frontal collision tests
• Amend para. 6.1. to clarify post-crash acceleration measurement
• Insert transitional provisions 12.12.–12.16. providing that as from the official date of entry into force Contracting Parties shall not refuse type-approvals under the 03 series, as from 1 September 2031 or 2029 [date TBD] shall not accept type-approvals to preceding series first issued after that date, until 1 September 2033 shall continue accepting preceding series approvals first issued before 1 September 2031 or 2029 [date TBD], may grant approvals to preceding series, and shall grant extensions of existing approvals
• Amend Annex 4 Table 1 to split engine throttle and accelerator pedal data elements, increase sampling rates to 10 Hz, extend recording intervals for rollover events, add pre-event synchronization timer, trigger activated, ACPE status, ADDW status, DDAW status, blind spot monitoring status, turn signal status, DCAS status, DCAS driver monitoring system warnings, emergency stop signal status, and time to collision data elements, and modify footnotes accordingly

The Subgroup on EDR held a conference call to discuss Event Data Recorder Step 2 specifications. Key discussions included: AEB trigger recording intervals, with agreement on -2.5 to 2.5 seconds; ADDW and DDAW data elements referred to GRSG with competing proposals in square brackets; DCAS data elements with unresolved differences between industry and UK proposals on recording intervals and frequency; time to collision (TTC) deferred to Step 3; engine throttle deletion deferred pending further consideration; transitional provisions with industry proposing 2031 implementation versus EC’s 2029; and EDR for ADS requiring further development. Memory definitions for R169 and R160 were agreed upon.

This document presents draft amendments to UN Regulation No. 169 for the EDR Step 2 workstream. It defines non-volatile memory as permanent EDR data storage retained after power loss, and volatile memory as temporary buffering that does not retain data. Requirements specify that EDRs capture and record data to non-volatile memory when triggered, with capacity for at least five events. Trigger conditions include sudden deceleration exceeding 3.25 m/s² for 0.7 seconds and vehicle stops at 0 km/h for 20 seconds. An amendment allows certain stop events to be recorded in volatile memory first, transferring to non-volatile memory when other triggers occur or the master switch deactivates, reducing memory wear in vehicles with frequent stops.

Proposal to amend the 03 Series of Amendments to UN Regulation No. 160 (Event Data Recorder). The document modifies definitions, recording conditions, and data elements for EDRs. Key changes include: renumbering paragraph 2.2 to 2.25; amending definitions for end of event time, engine throttle, non-volatile memory, and volatile memory; adding new definitions for rollover protection systems, advanced emergency braking systems, and driver assistance systems; clarifying trigger conditions for recording planar, rollover, and vulnerable road user events; specifying time zero establishment; adding transitional provisions; and expanding Annex 4 data elements table to include pre-event synchronization timer, trigger activated status, acceleration control for pedal error, driver distraction warning, driver drowsiness warning, blind spot monitoring, turn signal status, and emergency stop signal status.

Proposal to add retrieval of DSSAD time-stamp data elements recorded for at least the last 30 seconds before the last setting of the event flag “Event Data Recorder (EDR) trigger input” alongside EDR data through the same interface, add provisions for retrieval when no such event occurs within the last 30 seconds, add provisions to replace date and time with relative time information when required by national or regional law, and add detected collision by Automated Driving System as an EDR trigger for UN R160 and UN R169.