The Integration of transportation systems is a very important issue within our society. in order to realize more secure and efficient system, an integrated system needs to be development taht is decentralized, stable and highly automated. In previous papers we have proposed a three layer object model (3LOM) as the base architecture for the integration of transportation systems. This paper describes the design of the physical input/output sub-systems in the bottom layer of the architecture and how to implement this layer from the technical persepctive. This layer is primarily responsible for data acquisition,filtering and transmission of data to the midlle layer and related control centers. Local knowledge is organized to be used to ferform controlling functions within a localized environment. This paper is an important contribution to design the logical view the bottom layer as an important step to develop the proposed integrated transportation system as our ultimate aim.