The last decade has witnessed unprecedented changes in the technologies and processes involved in the construction industry. The philosophies associated with Industry 4.0 now reverberate in construction 4.0. Digitalization and interconnectivity in the cyber-physical systems of the sector are at the heart of such transformation. Construction 4.0 brings to the table a plethora of technologies and associated processes over the construction project lifecycle. The current study performs a state-of-art literature review to summarize the knowledge advancement in construction 4.0. A layered conceptualization spanning across project lifecycle utilizing the people-process-technology dimensions is presented to summarize the current understanding of Construction 4.0. The cyber-physical space is classified into the physical, digital tool, data, and core data security and interoperability layers. The inter-layer and intra-layer interactions and information flows are then conceptualized based on the extant literature, including the human interaction and interventions. The people-process-technology dimensions were discussed across the project lifecycle through interactions in these layers. It is observed that Construction 4.0 is set to be driven by data creation, data flow, data transformation, and data storage across the project lifecycle to ensure a collaborative environment across the stakeholders who interact and associate with different layers of Construction 4.0. The article finally presents challenges with the current formulations and explores ways to further our knowledge in the area.

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Construction Vehicle route planning forms a significant component of Construction Site Layout Planning (SLP). At present, the construction industry has no standard method of planning vehicle routes resulting in chaotic situations on sites. The study proposes an integration of optimization techniques with Building Information Modeling (BIM) to generate feasible routes taking into account the dynamic nature of construction projects. A systematic workflow is developed for the integration of these platforms. The steps involved in the process are presented through a case study highlighting a decision support system for project planners. The advantages of sensitivity analysis alongside a visual interpretation of the construction routing schedule are achieved through the integrated workflow. Thus, the developed workflow provides an approach to enhance the efficiency of daily equipment movements at the site by reducing the possible conflicts and enhancing accessibility. Though the study limits itself in handling the internal vehicular movements, the developed workflow could be extended to manage the project supply chain; moreover, the site personnel movements could be integrated to provide a safer work environment at the construction site.

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