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is paper investigated variations in accepted gaps and lane change duration on arterial under recurrent and non-recurrent congestion. Descriptive statistics and best-t distributions were obtained for the two parameters for both tra c conditions. Hypothesis testing using Mann-Whitney U-Test showed that the means of accepted gaps and lane change durations were statistically di erent between the two types of tra c conditions. e study found that during non-recurrent congestion, drivers on an average accepted smaller gaps but took longer lane change durations. Based on the fact that the data were collected for the same ow-rate (70-90 vehicles/minute) in both tra c conditions and based on the literature, the reason for the above ndings could be that, drivers get more frustrated during non-recurring congestion that they accept smaller gaps. Drivers visiting the study location for game day (non-recurrent) exhibit di erent driver behavioral characteristics when compared to regular commuters (recurrent) which could have also contributed to the statistical di erences in the lane changing characteristics of two types of congestion. ese ndings have direct implications on the lane changing parameters used in microscopic tra c simulation and also help transportation planners and managers to understand driver behavior during recurrent and non-recurrent congestion and be er manage the facilities.