This book constitutes the thoroughly refereedproceedings of the 4th International Conference on Smart Cities and Green ICTSystems, SMARTGREENS 2015, and the 1st InternationalConference on Vehicle Technology and Intelligent Transport Systems, VEHITS2015, held in Lisbon, Portugal, in May 2015.The 15 full papers of SMARTGREENS 2015 presentedwere carefully reviewed and selected from 73 submissions. VEHITS 2015 received27 paper submissions from which 3 papers were selected and published in thisbook. The papers reflect topics such as smart cities, energy-aware systems andtechnologies, sustainable computing and communications, sustainabletransportation and smart mobility.

SmartCity Concepts: Chances and Risks of Energy Efficient Urban Development.- SmartCities Concept and Challenges: Bases for the Assessment of Smart City ProjectsConstructing Human Smart Cities.- An Open Platform for Children's IndependentMobility.- Architectures and Requirements for the Development of Smart Cities:A Literature Study.- People in Smart Buildings: Daily Practices in AutomatedAreas.- Introducing Flexibility into Data Centers for Smart Cities.- AutomaticValidation for Crowd Simulation: Test Suite for a Pedestrian Simulator based onDifferent Scenarios.- A 2DOFvibrational Energy Harvester Exploiting VelocityAmplification: Modeling and Testing.- Voltage Control in Low Voltage Grids withDistributed Energy Resources: A Droop-based Approach.- A Sensitivity basedApproach for Efficient PMU Deployment on Smart Grid.- Using FlexibilityInformation for Planning the Energy Demand of Households.- Laser Scanner andCamera Fusion for Automatic Obstacle Classification in ADASApplication.- VehicleRouting to Minimizing Hybrid Fleet Fuel Consumption.- Service-OrientedArchitecture for Cloud Application Development.- An Integrated Architecture forSimulation and Modeling of Small- and Medium-sized Transportation andCommunication Networks.- Privacy Endangerment from Protocol Data Sets in VANETsand Countermeasures.