BRIEF ANALYSIS OF UN R157 AUTOMATIC LANE KEEPING SYSTEM

BRIEF ANALYSIS OF UN R157 AUTOMATIC LANE KEEPING SYSTEM

RELEASE DATE:2024-01-23 12:15
Brief: "Automated Lane Keeping Systems (ALKS)" refers to a system that controls the lateral and longitudinal movement of a vehicle for a long time without driver instructions, and belongs to "L3 level" automated driving. UN R157 is the first binding international regulation on autonomous driving systems in the transportation field. It was first adopted in June 2020 and will come into effect in January 2021. This marks a key step in the development of autonomous driving technology.


SCOPE
M and N category vehicles have a maximum speed limit of 130km/h.

SPECIFICATIONS OF ALKS
1. System Safety and Fail-safe Response: The system can safely perform dynamic driving tasks; perform emergency operations when there is an imminent risk of collision; support the driver to resume manual takeover at any time; if the driver does not take over after transition requirements, the system should perform the lowest risk operation .
2. Human-Machine interface/operator information: The driver availability recognition system should detect whether the driver is in the driving position, fastened the seat belt, etc.; the system can use an override strategy to safely transfer driving rights to the driver, etc.
3. Object and Event detection and Response: Sensing systems should be equipped to detect forward, lateral and rearward ranges.
4. Data Storage System for Automated Driving: A data storage system that meets regulations must be installed to record faults, etc. The stored data should be readable in a standardized manner and tamper-proof.
5. Cyber Security and Software-Updates: UN R155 and 156 should be followed and R157SWIN used to identify system software.

ALKS MAIN TEST ITEMS ANALYSIS
1. Lane keeping: It should be proven that ALKS keeps the vehicle moving stably in its lane. Maintain the speed for 5 minutes when the speed is lower than 60km/h, and ensure sufficient road length to enable the test > 60km/h...
2. Avoid collisions: ALKS should avoid collisions with passenger cars, two-wheelers, pedestrians, etc...
3. Following a lead vehicle: It should be proven that ALKS can maintain the required safe distance from the vehicle in front, and should be tested at least in the following scenarios: the vehicle in front is driving on straight and curved sections at a constant speed or variable speed; the vehicle in front is in different lateral positions; The average deceleration of the vehicle in front is ≥6 m/s2 until it stops...
4. Lane change of another vehicle into lane: When the vehicle cuts in with different lateral speed and acceleration, ALKS should avoid collision with it...
5. Lane change: The test should demonstrate that ALKS can correctly perform lane changes without causing unreasonable risks to the safety of vehicle occupants and other road users during LCP. Tests should be conducted at least in the following scenarios: vehicles approaching from behind and unable to Perform a lane change operation; vehicles with the same speed in adjacent lanes...

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Cathy
Cathy Yang
RND Department
ATIC Regulation Researcher, Master of Jinan University, responsible for interpreting automotive related regulations
Phone: +86 020-82510156
Mail: cs@atic-cn.com