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Crashes that occur at tollgates have different characteristics compared to those of the mainline on expressways in terms of crash cause, crash type, and vehicle type. Due to this fact, the safety performance function (SPF) focused on the expressway tollgates, apart from the mainline, should be developed. The aim of this study is, therefore, to identify the influential factors and develope a SPF for crashes at tollgates. Firstly, we established independent variables affecting crashes at tollgates through literature review and descriptive statistical analysis. Based on these variables, two negative binomial regression models with different form of independent variables were developed and goodness-of-fits of each model were compared. According to the results, the number of crashes increasesⅰ) as AADT, Hi-pass rate, and heavy vehicle rate increase, ⅱ) as average lane width decreases, ⅲ) on the mainline tollgate type. The safety performance function developed in this study could be applied to select hot-spots for expressway tollgates.