Information providing method and information providing system

An information providing system configured to communicate with an in-vehicle device installed in a vehicle via roadside antennas and communicate with a device installed in the vehicle via a network, and configured to store, in a storage, pieces of speed information of the vehicle in association with identification information of the in-vehicle device received from the in-vehicle device via the roadside antennas, each of the pieces of speed information having been stored in the in-vehicle device each time the vehicle moves a prescribed distance before the vehicle passes by the roadside antennas, the information providing system comprising:

• one or more processors;
• and
• one or more memories having instructions, when executed by the one or more processors, to cause the information providing system to perform operations, the operations comprising:
• retrieving the pieces of speed information of the vehicle in association with the identification information from the storage;
• and
• transmitting evaluation information to the device via the network to cause the device to display the evaluation information, the evaluation information indicating a frequency of occurrence of sudden acceleration events or sudden deceleration events of the vehicle, the frequency of occurrence being obtained from a proportion of differences between calculation values outside a threshold range, the calculation values being calculated on the basis of the pieces of speed information in a prescribed period corresponding to the pieces of speed information stored in the in-vehicle device.

An information providing system configured to communicate with an in-vehicle device installed in a vehicle via roadside antennas and store, in a storage, pieces of speed information of the vehicle in association with identification information of the in-vehicle device from the in-vehicle device via the roadside antennas, each of the pieces of speed information having been stored in the in-vehicle device each time the vehicle moves a prescribed distance before the vehicle passes by the roadside antennas, the information providing system comprising:

• one or more processors;
• and
• one or more memories having instructions, when executed by the one or more processors, to cause the information providing system to perform operations, the operations comprising:
• retrieving the pieces of speed information of the vehicle in association with the identification information of the in-vehicle device from the storage;
• and
• causing an information display device to display evaluation information in association with the identification information, the evaluation information indicating a frequency of occurrence of sudden acceleration events or sudden deceleration events of the vehicle, the frequency of occurrence being obtained from a proportion of differences between calculation values outside a threshold range, the calculation values being calculated on the basis of the pieces of speed information in a prescribed period corresponding to the pieces of speed information stored in the in-vehicle device.