UN R79: Proposal for amendments to the 03 and 04 series of amendments
Document GRVA/2023/6
24 November 2022

Proposal to clarify the logical cascade of actions relative to ACSF B1 and ACSF C systems:

When the same means is used by the driver to simultaneously activate the Automatically Commanded Steering Function of Category B1 (ACSF B1) and of category C (ACSF C), both functions switch to standby mode when the vehicle enters an ACSF C eligible road. But if the road is non-eligible to ACSF C, then only the ACSF B1 is activated.

With the current text of the regulation, once the vehicle moves to an ACSF C eligible road, the driver must operate again the means to activate the ACSF C. This second deliberate action is confusing for the driver since it makes the manipulation more complex. The current wording actually discourages most drivers from using this assistance function.

The proposed wording permits the following, logical, cascade of actions:

  1. The driver has done a deliberate action to activate ACSF B1 and ACSF C (on a non-eligible road); then
  2. He drives into an eligible road, and is clearly informed thereof; then
  3. He initiates a lane change procedure by activating e.g. the direction indicator.

Submitted by OICA
Status: Superseded
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Previous Documents, Discussions, and Outcomes
4.8.3. | Proposal for a Supplement 9 to the 03 series of amendments to UN Regulation No. 79 (steering equipment)
4.8.4. | Proposal for a Supplement 4 to the 04 series of amendments to UN Regulation No. 79 (steering equipment)
6. (b) | UN Regulation No. 79 (Steering equipment)

94. The expert from OICA offered to withdraw ECE/TRANS/WP.29/GRVA/2011/9, even though the content of the proposal was still relevant and important for his organization. Similarly, the expert from AVERE withdrew ECE/TRANS/WP.29/GRVA/2021/10. GRVA agreed that the Task Force on ADAS would aim at addressing the matters, too.

95. The expert from OICA introduced ECE/TRANS/WP.29/GRVA/2023/6, as amended by GRVA-15-30. He recalled the context of the proposal, already discussed at the fourteenth session of GRVA. He mentioned that their proposal received comments (GRVA-15-09) and that he addressed them with the amendment included in GRVA-15-52. The secretariat read the letter of the expert from Sweden, absent, who expressed support for ECE/TRANS/WP.29/GRVA/2023/6, as amended by GRVA-15-09.

96. The expert from OICA presented GRVA-15-53 with further provisions for an automatic change to a standby mode. GRVA agreed that a “suitable time delay” was one option to ensure that the vehicle has already reached a regular lane of travel, but GRVA could not identify a fixed time value and therefore agreed that such value could be subject to agreement between the manufacturer and the technical service during the approval process.

97. Following discussions, GRVA reached agreement on GRVA-15-54 and agreed to note in this report the justification and context related to GRVA-15-53, as summarized in para. 96 above.

98. GRVA adopted ECE/TRANS/WP.29/GRVA/2023/6, as amended by GRVA-15-54, and requested the secretariat to submit it as a supplement to the 03 series and 04 series of amendments to UN Regulation No. 79 (steering equipment) to WP.29 and AC.1 for consideration and vote at their June 2023 sessions.

Related and Previous Documents
Relates to UN R79