World wide social developments towards Mega-Cities, define future tasks for automotive safety systems. Advanced driver Assistance systems in combination with new preventive safety systems offer great potential for mitigating accidents, reducing accident severity and increasing occupant protection. Traffic in Mega-Cities is characterised by a much higher degree in complexity and dramatically reduced observation time. Thus, automotive safety systems have to face much faster decision requirements compared to present day cruse control systems. Hence, the capability to assess and perceive the actual driving situation in complex traffic situations is the key enabler for future vehicle comfort- and safety systems. The symbiotic exploitation of the electromagnetic spectrum by means of Radar- and optical sensors like Scanner and Vision sensors allows the comprehensive and precise detection even at adverse conditions. The article describes possible approaches.