Clarification on Safety Requirements for Constituent Systems in System of Systems Involving Automated Vehicles

In this paper, the safety requirements for constituent systems in system of systems (SoS) involving automated vehicles are defined based on the system models. Safety information related to the constituent systems is derived from the behaviour model of SoS to describe the safety requirements using SafeML (Safety modelling language), which is designed for modelling the safety-related concerns of a system using concepts of hazard, harm context, harm and defence. Safety functions for the constituent systems are derived from the defences to mitigate occurring harms, which are described by SafeML and also used in design of the automated driving system. It is shown from the description by SafeML that safety can be considered early in the design stage managing its complexity for the automated driving system.