Abstract: A system detects whether an automobile was involved in an accident. The system receives sensor data detecting motion of the automobile, for example, acceleration or location of the automobile. The system aggregates features describing the impact event including contextual features, for example, type of roadway, speed limit, and points of interest near the location of impact and event features, for example, force of impact, distance travelled since impact, speed before the impact, and so on. The system provides the features as input to a machine-learned model. The system determines using the machine-learned model whether the automobile was involved in an accident. The system may provide sensor data describing the impact to a neural network to generate feature vectors describing the sensor data. The system uses the feature vector for determining whether an impact occurred.