At present, with the increasing of extension engineering, there is a rightward zone in reconstruction and extension engineering. The traffic in the rightward zone is complex, and it is easy to cause traffic accidents. This paper takes a rightward zone as the research object and integrates macro and micro traffic flow parameters using Vissim simulation software. Select the average velocity, the coefficient of velocity variation, the equivalent minimum safety distance, and the deceleration as the evaluation index of driving risk. Based on analyzing the internal influence of traffic volume, the proportion of large vehicles, and the length of the transition section on each index, we determine the weight of each evaluation index by the entropy method. From a statistical point of view, divide the driving risk index into four grades: safety, relative safety, relatively danger, and danger. Establish the driving risk index evaluation model of work zone based on multiple linear regression. The results show that the partial regression coefficients of traffic volume, the proportion of large vehicles, and the length of the transition section to the driving risk index are 0.059, 0.317, and 0.15, respectively. Finally, we propose the driving risk evaluation model in this paper to analyze the example section. When the transition section length of the example section is 60 m and 100 m, the traffic risk index is 0.33 and 0.27, respectively. The evaluation results are consistent with the number of measured conflicts. Key words：Expressway; Work zone; Rightward zone; Vissim; Driving risk

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