Traffic accident morphological analysis is the prerequisite and condition of accident warning. Grey Relational Analysis is one of the important methods of morphological analysis of the accident, which can effectively solve the problem of inadequate sample size defects but cannot solve discrete data caused by the results of the analysis of the distortion problem. This paper adopts the least square method to improve the analysis of the correlation degree. The results show that the new method can effectively improve the accuracy and precision of the analysis, which provides a new means for the accident morphological analysis.
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