Spatiotemporal correlation modelling for machine learning-based traffic state predictions: state-of-the-art and beyond

ABSTRACT

Predicting traffic states has gained more attention because of its practical significance. However, the existing literature lacks a critical review regarding how to address the spatiotemporal correlation in the ML-based traffic state prediction models from a traffic-oriented perspective. Therefore, this study aims to comprehensively and critically review the spatiotemporal correlation modelling (STCM) approaches adopted for developing ML-based traffic state prediction models and provide future research directions based on traffic-oriented characteristics and ML techniques. Concretely, we investigate the neural network-based traffic state prediction models and characterise the STCM of these models by a proposed systematic review framework including three components: (i) spatial feature representation that demonstrates how the spatial information regarding road network is formulated, (ii) temporal feature representation that illustrates a variety of approaches to extract the temporal features, and (iii) model structure analyses the model layout to address the spatial correlations and temporal correlations simultaneously. Finally, several open challenges regarding incorporating traffic-oriented characteristics such as signal effects with ML techniques are put up with future research directions provided and discussed.

KEYWORDS:

• Literature review
• traffic state prediction
• spatiotemporal correlation
• neural networks
• intelligent transportation systems

Acknowledgements

Any opinions, findings, conclusions, or recommendations expressed in this study are merely those of the authors.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research is sponsored by Singapore Technologies Engineering under a joint research project entitled “Smart Traffic State Estimation and Short-term Prediction” [WBS R-302-000-252-592].