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Smart cities demand resources for rich immersive sensing, ubiquitouscommunications, powerful computing, large storage, and high intelligence(SCCSI) to support various kinds of applications, such as public safety,connected and autonomous driving, smart and connected health, and smart living.At the same time, it is widely recognized that vehicles such as autonomouscars, equipped with significantly powerful SCCSI capabilities, will becomeubiquitous in future smart cities. By observing the convergence of these twotrends, this article advocates the use of vehicles to build a cost-effectiveservice network, called the Vehicle as a Service (VaaS) paradigm, wherevehicles empowered with SCCSI capability form a web of mobile servers andcommunicators to provide SCCSI services in smart cities. Towards thisdirection, we first examine the potential use cases in smart cities andpossible upgrades required for the transition from traditional vehicular ad hocnetworks (VANETs) to VaaS. Then, we will introduce the system architecture ofthe VaaS paradigm and discuss how it can provide SCCSI services in future smartcities, respectively. At last, we identify the open problems of this paradigmand future research directions, including architectural design, serviceprovisioning, incentive design, and security & privacy. We expect that thispaper paves the way towards developing a cost-effective and sustainableapproach for building smart cities.

Vehicle as a Service (VaaS): Leverage Vehicles to Build Service Networks and Capabilities for Smart Cities