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Transportation is essential in daily life. Everyone is affected by transportation, whether directly or indirectly. Its availability influences how, where, and when we travel. Our transportation choices impact our work, leisure, and health. The daily dependence on automobiles has grown considerably in recent decades, with significant and growing environmental (e.g., greenhouse gas emissions) and health consequences (e.g., casualties). Instead of utilizing public transit, more commuters are driving. To better serve the public transit needs of the Karachi Metropolitan Area, the Karachi Circular Railway has been upgraded. The theory of planned behavior (TPB) predicted that Karachi locals would use the service because of their attitudes, perceived norms, and a sense of control. The findings indicated that perceived behavioural control had a substantial role in motivating individuals to use the Karachi Circular Railway. The results are that when residents feel they would use the Karachi Circular Railway for employment, they are more inclined to do so. The results suggest that subjective norms had no discernible influence on whether or not the Karachi Circular Railway was utilized for work-related reasons, demonstrating that this decision was made by those close to the participants who believed the Karachi Circular Railway was appropriate. The findings of this study can help Pakistani policymakers make better plans for the future enhancement of public transportation systems.