WP.29/2026/215
UN R171: Proposal for a Supplement 4
Source(s)
Date
7 Sep 2026
Status
Formal WP.29 review
Subject
Impact
Original text | Supplement 4
Meeting(s)

Proposal to:

  • Insert new Introduction paragraph 17 describing continuous review of DCAS based on technology development and monitoring data,
  • Amend para. 2.11. to define ‘Target Lane’,
  • Amend para. 5.3.5.1. to specify system boundary detection and assistance termination,
  • Amend para. 5.3.7.1.4. to require warning signals when steering support diminishes,
  • Amend para. 5.3.7.2.1.1. to require driver non-disengagement for 2 seconds before manoeuvre initiation,
  • Insert para. 5.3.7.2.1.13. requiring manufacturer description of system behaviour if driver disengages during manoeuvre,
  • Amend para. 5.3.7.2.3.1. to ensure sufficient driver confirmation time,
  • Amend para. 5.3.7.3.1. to require compliance with 04 or later series of UN R79 Risk Mitigation Function,
  • Amend para. 5.3.7.5.1.1.2. to require driver information on headway configuration below 2 seconds,
  • Amend para. 5.5.3.1. to require ‘off’ mode at powertrain initiation,
  • Amend para. 5.5.4.1.1. to add intended driver-confirmed manoeuvres to driver information,
  • Renumber and amend para. 5.5.4.2.2.3. to prioritize simultaneous emergency assistance system warnings,
  • Amend paras. 5.5.4.2.5.2. and 5.5.4.2.5.2.1. to define visual disengagement and re-engagement criteria,
  • Amend para. 5.5.4.2.7. to add disengagement detection strategies,
  • Amend para. 5.5.4.2.8.1. to disable system activation upon prolonged insufficient engagement,
  • Amend para. 6.2.4.1. to specify deceleration limits for approaching vehicles,
  • Amend para. 14.2. to exclude software update approvals from discontinuation determination,
  • Delete Annex 3 paras. 2.15. and 2.16.,
  • Amend para. 3.1.1. to specify documentation package retention periods of 10 years from production discontinuation,
  • Renumber para. 3.5.7. to 3.4.5.,
  • Insert new para. 3.5.5. on safety management during operation phase,
  • Renumber former para. 3

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