Collective Travel Planning in Spatial Networks

Shuo Shang, Lisi chen, Zhewei Wei, Christian Jensen, Ji-Rong Wen, Panos Kalnis

Research output: Contribution to journalArticlepeer-review

95 Scopus citations


Travel planning and recommendation are important aspects of transportation.We propose and investigate a novel Collective Travel Planning (CTP) query that finds the lowest-cost route connecting multiple sources and a destination, via at most k meeting points. When multiple travelers target the same destination (e.g., a stadium or a theater), they may want to assemble at meeting points and then go together to the destination by public transport to reduce their global travel cost (e.g., energy, money, or greenhouse-gas emissions). This type of functionality holds the potential to bring significant benefits to society and the environment, such as reducing energy consumption and greenhouse-gas emissions, enabling smarter and greener transportation, and reducing traffic congestions. The CTP query is Max SNP-hard. To compute the query efficiently, we develop two algorithms, including an exact algorithm and an approximation algorithm. The exact algorithm is capable finding the optimal result for small values of k (e.g., k = 2) in interactive time, while the approximation algorithm, which has a 5-approximation ratio, is suitable for other situations. The performance of the CTP query is studied experimentally with real and synthetic spatial data.
Original languageEnglish (US)
Pages (from-to)1132-1146
Number of pages15
JournalIEEE Transactions on Knowledge and Data Engineering
Issue number5
StatePublished - Dec 17 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01


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