This document discusses using big data from sensors on buses to analyze bus operations and improve efficiency. It summarizes: 1. 500GB+ of sensor data was collected from 26 buses over 4 years, including GPS, speed, engine data, fuel usage, temperature, and more. 2. Random forest models were used to automatically classify 11 operation states like idling or moving, achieving 81-93% accuracy and reducing the need for manual input. 3. Further models using random forest regressors and a few sensor features estimated passenger counts with 94-96% accuracy, helping optimize routes and charter profits without expensive dedicated equipment. 4. Additional applications discussed include detecting driver fatigue, road damage identification, and