The applications of ITS in smart cities are one of the many IT applications resulting from the implementation of IoT applications. Some of the barriers to exploiting the IoT in city mobility management include: Different devices and communication protocols to be fully compatible with each other is a significant challenge when it comes to the IoT. This research presents a new system design in an attempt to enhance the communication and overall compatibility of devices in smart city ITs based on IoT architecture. We then proceed to the identification of the needs and constraints not only of the various stakeholders, infrastructure as well as mobility services that make up smart city transport system but also the individual systems that comprise it as well. The feature of modularity is inbuilt into our system to allow for the integration of various internet connected devices, sensors and communication protocols generally found in urban mobility systems. Its human interface or terminal requires an application interface that can be adapted to connect with other ITS applications The software architecture also comprises a data acquisition layer, a middle layer that handles protocols and data formatting in its entirety, among others. Our primary goal is to reflect changes in the conditions of smart city environments and new trends in IoT standards, so it is relevant to use a standard-based approach prioritizing compatibility and extensibility. With a parallel aim to supporting previously deployed IoT devices and also for forward compatibility the system employs standard IoT protocols such as MQTT, CoAP and HTTP. If we desire better mechanisms to express and understand data in different systems and platforms, namely semantic interoperability, we need to adopt common data models and ontology definitions. To show that their recommended system architecture works, we build a proof of concept in a digital smart city environment. Using their features and behavior, we substantiate the neurological and tender integration of various IoT devices including traffic sensors, vehicle tracking systems and units, public transportation facilities, and stations, and environmental measuring platforms. The current design of our systems can be seen as offering a solid means of enhancing the usage of the Internet of Things as a means of enabling ITMS to exchange information between itself and other systems. In Smart cities, this framework provides ways of developing proper mobility systems that are proper, friendly to the environment, and all geared towards satisfying the users.