Brief: On November 17, 2021, the official EU Intelligent Speed Assistance (ISA) regulation was published under the regulation number (EU) 2021/1958. ISA is a system that prompts and encourages drivers to slow down when they are over the speed limit. The system works with the driver as an assisting function to avoid speeding accidents or mitigate their consequences. At present, many vehicle types are also equipped with other driving assistance functions, such as cruise control. In some scenarios, ISA may interact with other driving assistance functions. This article will analyze the relevant certification requirements.

SCENARIOS WHERE SPEED IS ACTIVELY CONTROLLED BY VEHICLE SYSTEM
In (EU) 2021/1958, the scenario where the vehicle speed is actively controlled by the vehicle system appears in clauses 3.5.2 and 3.6.2 of Annex 1 "At times when the driving speed of the vehicle is actively controlled by a vehicle system where the driver is not expected to be touching the accelerator control (e.g. cruise control) ".

 
The technical requirements in this scenario are specified separately according to whether the ISA is equipped with an SCF or SCF-like characteristics.
For ISA not equipped with SCF or SCF-like characteristics, the use of a haptic warning is not permitted, in this case a visual warning and a cascaded acoustic warning shall be provided, or the system shall attempt to reduce the driving speed to or below the perceived speed limit automatically, e.g. by disengaging or reducing engine power.
For ISA equipped with SCF or SCF-like characteristics, the use of haptic warning is similarly not permitted, a SLWF consisting of a visual warning and a cascaded acoustic warning is activated instead, or the SCF shall attempt to limit the speedometer speed to the perceived speed limit.

TEST REQUIREMENTS
The ISA Regulation (EU) 2021/1958 has two tests for the above scenarios where the vehicle speed is actively controlled by the vehicle system, Test 3 of 4.4.4.1 and Test 3 of 4.4.4.2. The tests shall be performed with an activated SLWF and the driver aid controlling the speed of the vehicle for least one speedometer speed.
The test pass criteria shall be that visual and acoustic warnings are presented or the system disengages or attempts to reduce the driving speed to the perceived speed limit automatically.

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