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In this paper, the invisible hand concept for the definition of Advanced Driver Assistant Systems (ADAS) Human Machine Interfaces (HMI) is introduced. The main idea is that these systems become a sort of "invisible hand'' able to support the driver and to increase driving safety if they are integrated with each other (i.e., longitudinal, lateral and rear control) and the most "persuasive'' and "efficient'' interaction between driver and ADA systems is developed. Here the analysis is conducted taking into consideration the technological evolution scenario and the identification of related user interaction aspects (including technical and communication analysis). Moreover, the ways to design the best interaction between drivers and ADAS interfaces from communication and HMI points of view has been included as well as an overview of the user centered approach adopted in the Centro Ricerche Fiat's design process.

The AICC is an assisting system for controlling relative speed and distance between two vehicles in the same lane. The AICC system may be considered as an extension of a traditional cruise control, not only keeping a fixed speed of the vehicle, but correcting it also to that of a slower one ahead. The main objective of this paper is to illustrate the design of the intelligent cruise control system involving the automatic control of throttle position and braking systems. There is much evidence nowadays that fuzzy approaches to real problems, where the linear control theory fails or can't provide an available and robust design solution, are often the best alternative to more familiar schemes.