Abstract
Since the advantage of hidden Markov model in dealing with time series data and for the sake of identifying driving style, three driving style (aggressive, moderate and mild) are modeled reasonably through hidden Markov model based on driver braking characteristics to achieve efficient driving style. Firstly, braking impulse and the maximum braking unit area of vacuum booster within a certain time are collected from braking operation, and then general braking and emergency braking characteristics are extracted to code the braking characteristics. Secondly, the braking behavior observation sequence is used to describe the initial parameters of hidden Markov model, and the generation of the hidden Markov model for differentiating and an observation sequence which is trained and judged by the driving style is introduced. Thirdly, the maximum likelihood logarithm could be implied from the observable parameters. The recognition accuracy of algorithm is verified through experiments and two common pattern recognition algorithms. The results showed that the driving style discrimination based on hidden Markov model algorithm could realize effective discriminant of driving style.
Highlights
Due to terrible traffic accidents in recent years, a new approach shared by those conducting traffic safety researches has been to explore the cause of the accident and the formation mechanism from the perspective of the driver’s driving style
That is to say each observation sequence consists of 8 braking feature values, which means each sequence includes 8 brake, in the whole experiment, 30 subjects had an average of 60 braking for each one, that is 30 × 60 = 1800 brake, the 60 braking for each person is divided into 6 non repetitive sequences with each observation sequence as a the sample, there are 30 × 6 = 180 samples
The corresponding driving style type of the maximum logarithmic likelihood values were homologous to three driving style such as aggressive (S5 Fig), moderate (S6 Fig) and mild (S7 Fig)
Summary
Due to terrible traffic accidents in recent years, a new approach shared by those conducting traffic safety researches has been to explore the cause of the accident and the formation mechanism from the perspective of the driver’s driving style. This approach is considered as a popular new area of research in traffic safety and traffic psychology.
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