Qatar has initiated a vast megaproject including an integrated transportation service. To meet the need for ongoing demand, the Government of the country instigated the bus and taxi service under the KARWA banner. The study aims to evince the sustainability of the KARWA service. In terms of acceptance, it is evident that those different modes of transportation have two different scenarios. Therefore, the study evaluated the sustainability of bus which is comparatively lower acceptance in terms of public acceptance. It is observed that public acceptance could be regulated following different aspects such as time reliability, safety, comfort, and privacy, etc. On the other hand, the taxi service is evaluated following the technological aspect. For KARWA Taxi, three-car technologies have been compared, which were Conventional Internal Combustion Engine, Electric, and Hybrid Cars. It has been found that Hybrid Taxis have better performance in terms of cost, emission reduction, mobility, and traffic noise compared to conventional cars. Finally, for those two modes, the application of smart technology is evaluated, and it is inferred that the utilization of the tools in a sufficient manner can make those transportation more sustainable.