This thesis deals with the topic and describes the importance of telematics systems and open data. Telematics systems are systems in vehicles that enable optimal vehicle operation and help the driver perform optimal driving actions. Traffic data has a great influence on the optimal operation of these systems. These data are most often used within the framework of one company and are inaccessible to every user. On the contrary, open data is available to all users and anyone can collect, analyze, change and publish it in various ways. Some of the available sets of open traffic data are presented at the EU level. One of the sets is in the Republic of Croatia, i.e. in the city of Zagreb, where a strategic noise map is shown. Using Google Forms program support, a survey was conducted with the aim of obtaining information about the acquired knowledge of users related to telematics systems and their applications and open data. The survey consists of 29 questions. Some of the questions are: knowledge of the concept of open data and ITS, the possibility of using and sharing open data between users, the possibility of using new applications that use open data, etc. The results of the survey show the attitude of respondents about the use of open data and about applications that use open data. They can be used to influence safety, comfort and productivity. And they proved to be a great advantage and a good guideline when developing transport systems and applications.