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Bluetooth Technology (BT) has been used as a relatively new cost-effective measurement tool for travel time. However, due to low sampling rate of BT compared to other sensor technologies, the presence of outliers may significantly affect the accuracy and reliability of travel time estimates obtained using BT. In this study, the concept of outliers and their impact on travel time accuracy are discussed. Four different estimators, namely Min-BT, Max-BT, Med-BT and Avg-BT, were used to estimate travel times using BT. By means of various estimation methods, it is tried to evaluate the impact of estimation method on the accuracy of estimated travel time using BT. Two sources of Floating Car Data (FCD) were used as the ground truth in order to quantify and evaluate the accuracy of travel time profiles obtained by BT. Three aggregation techniques including arithmetic mean, geometric mean and harmonic mean …