Using mobile sensor data to encourage safer driving

This post details how Grab uses telematics data from driver and delivery partners' mobile phones to encourage safer driving. It explains the process of collecting sensor data (accelerometer, GPS) and using custom algorithms to infer vehicle acceleration from phone sensor data, accounting for orientation and data quality variations. The post also describes how unsafe driving instances (braking, acceleration, cornering) are detected using thresholding and how speeding is identified by comparing GPS speeds with map data and aggregated speed statistics. The aim is to proactively detect and mitigate unsafe driving behaviors to reduce accidents and improve user experience.