The present invention relates to methods and devices for collecting information related to traffic accidents. A method in a first electronic sensor device involves the detection of a traffic accident, retrieving information regarding available other electronic sensor devices at the location of the traffic accident, and activating at least one of the available other electronic sensor devices to send any traffic accident data recorded at the time for the traffic accident to a traffic information service. According to a method in a traffic information service node, the method includes receiving a traffic accident alert message from an electronic sensor device, retrieving information regarding available electronic sensor devices at the location of the traffic accident, activating at least one of the available electronic sensor devices to send any recorded traffic accident data and receiving, organizing and storing the traffic accident data.