# Optimization of Carsharing Fleet Placement in Round-Trip Carsharing Service  
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1 Interdisciplinary Centre for Security, Reliability and Trust (SNT)-Faculty of Science, Technology and Medicine/Computer Science and Communications(FSTM/CSC), University of Luxembourg, Esch-sur-Alzette, 4364 Luxembourg, Luxembourg; [EMAIL_ADDRESS] (B.C. );  
2 Schoof Information Technology (SIT), King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand 2  
[PERSON]  
2 School of Information Technology (SIT), King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand 2  
[PERSON]  
1 Interdisciplinary Centre for Security, Reliability and Trust (SNT)-Faculty of Science, Technology and Medicine/Computer Science and Communications(FSTM/CSC), University of Luxembourg, Esch-sur-Alzette, 4364 Luxembourg, Luxembourg; [EMAIL_ADDRESS] (B.C. );  
2 Schoof Information Technology (SIT), King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand 2  
[PERSON]  
3 Exakowtee S.A., Esch-sur-Alzette, 4263 Luxembourg, Luxembourg; [EMAIL_ADDRESS]  
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4 Laboratoire d'Informatique, du Traitement de l'Informati et des Systeme (LITIS), Faculty of Science and Technology, Normandie University, 76600 Le Harve, France; [EMAIL_ADDRESS]  
[PERSON]  
5 Interdisciplinary Centre for Security, Reliability and Trust (SNT)-Faculty of Science, Technology and Medicine/Computer Science and Communications(FSTM/CSC), University of Luxembourg, Esch-sur-Alzette, 4364 Luxembourg, Luxembourg; [EMAIL_ADDRESS] (B.C. );  
6 Faculty of Computing and Telecommunications, Poznan University of Technology, 60-96 Poznan, Poland; [EMAIL_ADDRESS]  
[PERSON]  
5 Interdisciplinary Centre for Security, Reliability and Trust (SNT)-Faculty of Science, Technology and Medicine/Computer Science and Communications(FSTM/CSC), University of Luxembourg, Esch-sur-Alzette, 4364 Luxembourg, Luxembourg; [EMAIL_ADDRESS] (B.C. );  
6 Faculty of Computing and Telecommunications, Poznan University of Technology, 60-96 Poznan, Poland; [EMAIL_ADDRESS]  
[PERSON]  
1 Interdisciplinary Centre for Security, Reliability and Trust (SNT)-Faculty of Science, Technology and Medicine/Computer Science and Communications(FSTM/CSC), University of Luxembourg, Esch-sur-Alzette, 4364 Luxembourg, Luxembourg; [EMAIL_ADDRESS] (B.C. );  
Schoof Information Technology (SIT), King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand 2  
the United Kingdom where the government provided support to extend the user base to 600,000 individuals by 2020 to reduce traffic and parking problems [2]. The carsharing model can be divided into free-floating and station-based [2]. Free-floating carsharing offers the highest degree of flexibility to the users. They pick up the nearby vehicle to start a trip and drop it off anywhere in the city to end the trip. However, flexibility comes with a high operational cost for the company, which needs to maintain a high density of vehicles even in low-demand areas of the city in order to cope with low levels of utilization. Additionally, vehicles that end up in low demand areas need to be reallocated. An example of well-known free-floating carsharing companies are SHARE NOW (which is the merge of Car2 Go and DriveNow) [1]. In station-based carsharing, fleet vehicles are stationed in densely populated areas of the city and need to be returned to one of these locations after completing the trip (one-way) or to the same pick up area (round-trip). As a result, station-based services are less flexible, with an advantage of easier implementation and management. Station-based services require fewer cars, as carsharing operators can place vehicles in densely populated and high-demand zones of the city only, and no fleet relocation is typically required. An example for easier implementation and management is taken from bike-sharing. The bicycles need to be relocated everyday to maintain the service function, which is relatively easy because of their sizes.