2.2.4. Management of Vehicle Trajectories

Utilizing the vehicle trajectory data, several applications can be carried out and information of great importance can be provided. Thus, it is required that the vehicle location data be organized in detail on a comprehensive dataset along with supplementary information (such as the type of the vehicle). Researchers and engineers can interpret the measured data to understand the way the vehicles move.

## **3. Case Study Experiment**

The described methodology was applied on a multilane roundabout layout where the complexity of driving behavior is challenging as the road geometry provides high uncertainty in driving maneuvers. The method was tested for two different lighting conditions: daylight and night. An analysis on vehicle trajectories was carried out to extract microscopic traffic data such as vehicles speeds, travel time measurements, and the spatial distribution of vehicle maneuvers. The selected multilane roundabouts (Figure 5) are in the cities of (a) Larissa and (b) Thessaloniki (Greece).

**Figure 5.** UAV shot of the examined case studies: (**a**) Larissa and (**b**) Thessaloniki.
