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Pedestrian traffic has less priority than vehicle traffic in Turkey’s transportation system. In recent years, there has been a growing interest in understanding pedestrians’ behavior. This paper investigates high school students’ (15-18 age range) gap acceptance behavior at unsignalized midblock crossings by designing a before and after study. The midblock crossing is conventional in the first situation. But after, the midblock crossing is raised. This paper aims to find the effect of raised midblock crossing on pedestrians’ acceptable gap behavior. In this study, a midblock crossing near a high school in Izmir City was chosen. Data was gathered by using two video cameras in the morning (7.00-8.00 AM). The obtained data were extracted from the footage. The data were analyzed by performing two-way and one-way analysis of variance (ANOVA). The legal crossing rate of the students increased with the installation of the raised midblock crossing. Also, average vehicle speed and 85th percentile speed determined for both situations. Thus, the number of acceptable gaps increased as well as the waiting time decreased significantly. [ABSTRACT FROM AUTHOR]