Abstract
This report evaluates the efficacy of a cooperative intelligent i transport systems (C-11s) technology designed to communicate traffic light information to connected vehides. As a part of the NordicWay 3 project, a sample of 15 drivers participated in a controlled study using an application displayed in the car's infotainment display. The app was developed to display traffic light status, road work warnings and recommended speed to optimize intersection crossing times. Participants completed two t rips along a designated route, one without the app functionalities and one with the functionalities being active. During trips, vehicle data such as speed, energy influx and efflux within the battery system was collected. In addition, traffic light data was relayed as the car approached each intersection. After each pair of crips, the participant answered a survey about how they experienced the app's influence on t heir driving behaviour and how they evaluated interface quality. Survey responses towards the utility and functionality of the app were generally positive, with participants also stating that the app was helpful. Insights into vehicle data revealed a consistent behaviour in intersect ions whether the driver used the app or not. This indicates that the properties of the intersect ion itself could be the dominating factor influencing driver behaviour in this test. Despite some variance between drivers' perceived and actual measured benefits of the app, the participants underscore the potential of C-ITS technologies to contribute constructively to the driving experience.