Data transmitting apparatus and traffic data distribution apparatus

A data transmitting apparatus to be mounted on a vehicle, the data transmitting apparatus comprising one or more processors and one or more memories storing instructions that cause the one or more processors to:

• communicate with a server;
• estimate an attitude of the vehicle based on output of (i) an acceleration sensor configured to detect acceleration rates that act on a vehicle body in a front-rear direction and a right-left direction and a yaw rate sensor configured to detect a yaw rate of the vehicle body, wherein the attitude comprises an unstable state in which one or both of the acceleration rates in the front-rear direction and the right-left direction are greater than or equal to respective predetermined thresholds and a direction in which a lateral acceleration rate acts is in reverse of a direction in which the yaw rate acts;
• determine that an abnormal state has occurred based on detecting that a braking operation and a steering operation are simultaneously performed while the attitude of the vehicle is in the unstable state, wherein the abnormal state comprises at least one of encountering a tail end of a traffic jam or an obstacle;
• record output of the acceleration sensor, the yaw rate sensor, a brake control unit, a steering angle sensor, and at least one of a stereo camera device, a millimeter-wave radar device, or a laser scanner device, and location data of a point where the abnormal state has been determined, for a predetermined period of time;
• perform transmission of predetermined primary data to the server through the one or more processors when the one or more processors determines that the abnormal state has occurred, wherein the predetermined primary data comprises the location data and output of the brake control unit and the steering angle sensor regarding a driving operation state, and wherein a data volume of the predetermined primary data is smaller than a data volume of secondary data;
• and
• perform transmission of secondary data having a data volume greater than a data volume of the predetermined primary data to the server through the one or more processors upon receipt of a data request transmitted by the server in response to the transmission of the predetermined primary data, wherein the secondary data comprises output data of the at least one of the stereo camera device, the millimeter-wave radar device, or the laser scanner device.