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The problem of increasing congestion on highways has become a world-wide issue. It is not always feasible and often also not desirable to add highway lanes. This paper focuses on a particular class of solutions: Automated Vehicle Guidance (AVG) systems. They can be defined as systems in which the driving task is taken over partially or entirely by an automated system. Through automation, AVG systems have the potential of enabling safe driving with short inter-vehicle distance at high speeds and hence have been considered as a promising tool to improve highway traffic and safety. Two important and challenging questions motivated this research. First, how AVG systems may develop from the current vehicle-highway systems to a possible future state such as a fully Automated Highway Systems (AHS). Second, to understand which factors may affect the development of AVG in which ways.