Developing Machine Learning-based Approach for Predicting Road Surface Frictions using Dashcam Images – A City of Edmonton, Canada, Case Study

Although road surface friction is considered the most effective performance measure for maintenance operations, it is not commonly used due to the high cost of collection. As a result, most jurisdictions use subjective visual indicators that qualitatively describe the state of the road surface, even though they create measurement inconsistencies and offer less detailed maintenance tracking. For maintenance personnel to transition into using friction, the collection cost must be reduced. This paper attempts to do so by proposing a low-cost, machine-learning-based method for predicting road surface friction using dash camera imagery and demonstrates its feasibility through a case study. The dataset used for this project was collected in the City of Edmonton, Alberta, during its 2021/2022 winter season. Three models were developed using tree-based algorithms, where all three displayed high performance with an average RMSE of 0.0796 or 79.3% accuracy based on RMSPE.