The present disclosure that relates to automatic generation of activity determinations of a vehicle and generation and provision of notifications thereof. As an example, a trained model is applied that is adapted to execute a contextual analysis of signal data, including activity signal data retrieved from analysis of signals provided by a mobile computing device onboard a vehicle, and generate activity determinations therefrom. Exemplary graphical user interface (GUI) notifications can be automatically generated pertaining to activity determinations of a vehicle (vehicle activity determinations), where the GUI notifications can be automatically provided to one or more users. For instance, a GUI notification is automatically provided to an emergency contact of a driver in real-time (or near real-time) when it is detected that a vehicle has stopped (e.g., on a specific road such as a highway). Additional examples of the present disclosure pertain to an improved GUI for a driving safety application/service.