To determine these requirements, it was necessary to determine the areas where the needs lie. We defined these areas as vehicle behavior in five time periods.

These five time periods related to incidents such as traffic accidents and congestion have been defined as: before, immediately before, during, immediately after and after. Vehicle behavior were divided into the following: longitudinal behavior, lateral behavior and intersection behavior.

The needs in each of these areas were thoroughly studied and analyzed. As a result, what is needed in terms of dividing assistance and infrastructure improvements to reduce accidents and congestion has been made clear.