UN R157 — Supplement 3 to the 00 series of amendments

The Regulation now applies to the type approval of vehicles of Categories M and N with regards to their ALKS (para. 1.1.). Before this supplement, it applied to vehicles of Category M1. In the Introduction, the words “and passenger cars (M1 vehicles)” are deleted after “limits the operational speed to 60 km/h maximum”.

The table in paragraph 5.2.3.3. now has minimum time gap and minimum following distance columns for M2/M3 // N2/N3. Notwithstanding the formula result, at present speeds below 2 m/s the minimum following distance must never be less than 2 m for M1, N1. In the same case, it must never be less than 2.4 m for M2, M3, N2, N3. Before this supplement, this sentence gave 2 m and named no vehicle categories.

Paragraph 5.2.5.2. now says that the activated system must avoid a collision with a “cutting-in vehicle”, instead of a “cutting in vehicle”. In the definition of Vrel, “Relative velocity” now starts with a capital letter.

The logic signal indicating emergency braking must now be as specified in UN Regulation No. 13-H or 13, as appropriate. Before this supplement, paragraph 5.3.4. referred to UN Regulation No. 13-H.

In paragraph 7.1., item (b) now reads “Along the full length of the vehicle or combination and up to the limit of the lateral detection range”. Under paragraph 7.1.2., the declared lateral detection range must cover the full width of the lanes immediately left and right “of the vehicle or combination”. Before, it said “of the vehicle”. In paragraph 7.1., the most notable other requirements that it is without prejudice to are now paragraphs 5.1.1. and 5.1.2. Where the ALKS can operate with a vehicle combination, paragraph 7.1.5. now requires a demonstration to the Technical Service at the time of type approval. The manufacturer must show the strategies implemented to make sure that the sensing capability is always sufficient for the length of trailer attached.

The activated system must comply with traffic rules relating to the DDT in the country of operation, now “including responding to emergency/enforcement vehicles” (para. 5.1.2.). In the definition of “Unplanned event” (para. 2.5.), the examples now follow the words “This may include:”. The examples now name “approaching emergency vehicles/enforcement vehicles” and “missing lane markings”, and “(collision)” after “load falling from truck” is deleted. Before this supplement, they named an “approaching emergency vehicle” and a “missing lane marking”.

Paragraph 8.4.3. is replaced by the heading “Retrievability of data” and paragraphs 8.4.3.1. to 8.4.3.3. Under paragraph 8.4.3.1., for vehicles of Category M1 and N1, the data elements listed in paragraph 8.3.1. must be retrievable even after an impact. The impact severity level is set by UN Regulations Nos. 94, 95 or 137, as applicable. For Categories M2, M3, N2 and N3 (para. 8.4.3.2.), the data elements listed in paragraph 8.3.1 must be retrievable even after an impact. To demonstrate that capability, either (a) and (b) apply, or (c) applies. Under (c), the manufacturer demonstrates fulfilling the requirements of paragraph 8.4.3.1.