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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Clustering for labels using unsupervised learning for familiarity vs. interaction frequency for vehicles 1−6. The cluster in blue represents untrustworthy vehicles, whereas the cluster in red depicts trustworthy vehicles.