Citation

Mussone L, Kim K. J. Adv. Transp. 2010; 44(3): 162-175.

Copyright

(Copyright © 2010, Institute for Transportation, Publisher John Wiley and Sons)

DOI

unavailable

PMID

unavailable

Abstract

In this paper, a powerful tool for analyzing motor vehicle data based on the vector quantization (VQ) technique is demonstrated. The technique uses an approximation of a probability density function for a stochastic vector without assuming an “a priori” distribution. A self-organizing map (SOM) is used to transform accident data from an N-dimensional space into a 2-D plane. The SOM retains all the original data yet provides an effective visual tool for describing patterns such as the frequency at which a particular category of events occurs. This enables new relationships to be identified. Accident data from 3 cities in Italy (Turin, Milan, and Legnano) are used to illustrate the usefulness of the technique. Crashes are aggregated and clustered crashes by type, severity, and along other dimensions. The paper includes discussion as to how this method can be utilized to further improve safety analysis.