In recent years, there has been a paradigm shift from providing and designing cities for car towards promoting active travel modes, micromobility, and in general sustainable and walkable cities. In this regard, the Government of KSA has initiated the NEOM city project which aims to develop a 5 min-travel, sustainable and carbon free city. The project includes “The Line” which is a 170-km long and 200 m wide linear city. This futuristic megacity with the linear core is the inspiration for the model developed in this study using PTV Visum which can be a decision support system for such a megaproject. However, there are several challenges that need to be solved to model such a futuristic city. One of the most pressing issues is that the futuristic city will consist of a large number of modes such as, flying taxis, micromobility, autonomous demand responsive pods, and water mobility. Further, the envisaged cities consist of free public transport, extensive use of vertical mobility due to height, and negligible car ownership, which makes it challenging to generate behaviourally intuitive results. However, by carefully coding the supply and calibrating the demand parameters, an intuitive model is developed which is in line with the planned key performance indicators, including the mode shares, average distance between activity pairs, and volume to capacity ratios. The steps would be interesting for transport modellers and practitioners to model multimodal futuristic cities. Further, the results indicate it is possible to create mega-cities with negligible level of car ownership.