Despites of the efforts made by government for introducing BRT to ensuring the congestions situation can be improved in Dar es Salaam still commuters experience long waiting time at terminals, overcrowding of the passengers, and little adherence of schedule. The main objective of this study is to assess the factors that influence operational performance of Dar es Salaam Bus Rapid Transit. The data were collected in BRT main corridor of Phase one through questionnaires, interview, and observation. The collected data includes bus capacity, travel time, and bus availability. The study used 400 sample sizes for questionnaires and interview respectively where 334 (83.5%) respondents were accessed. The findings show that all predictor’s variables are positively affecting operational performance of bus rapid transit (BRT) due to its influence with the positive correlation value and statistically significance. It’s concluded that Dar es Salaam BRT suffer in operational underperformance resulted from inadequate number of the buses and it recommended that the agency and distinguished responsible authority should make sure the required buses and others operations requirement tools are found so as to meet the commuters’ requirements and the project expectations.