For instance, there is a large variety of ready-for-use technologies and business solutions in the field of autonomous toll systems, real-time traffic light optimisation, Global Positioning System (GPS)-based data collection, and real-time traveller information. However, consideration should also be given to the interactions between technologies. Smart transportation is an integrated system where efficiency depends on a set of technologies rather than on just one or a few. This also means that consideration should be given to the future development of the system, including its expansion and upgrading.