A Study on Effect of Information from Navigation System on Driving Behavior

In recent years, navigation services using smartphone applications have become common, and while the number of users is increasing, accidents and violations have begun to occur due to drivers being so focused on obtaining information that they cannot see their surroundings or the information itself is incorrect. Therefore, this study focuses on the fact that stress on drivers caused by such guidance can also be a cause of accidents, and aims to understand the understandability of information and driving behavior of navigation systems and stress by using a driving simulator. From the questionnaire survey by the users, it was found that not only the difficulty in understanding the screen of the navigation system, but also dangerous behavior due to misinterpretation of voice instructions occurred. Therefore, we varied the screen size and voice timing of the car navigation system to investigate the ease of recognizing the road to turn right and stress during driving. The results showed that the ease of viewing the map and the timing of the voice caused the same level of stress to the driver. It can be concluded that not only a large display but also appropriately timed voice is necessary for safe driving.