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Vehicular ad hoc networks (VANETs) are considered as a subset of mobile ad hoc networks (MANETs) that can be used in the transportation field. These networks considerably improve the traffic safety and accident prevention. Because of the characteristics of VANETs such as self-organization, frequent link disconnections and rapid topology changes, developing efficient routing protocols is a challenging task. To address this issue, clustering is an appropriate approach in a mobile environment. Clustering aims to partition the vehicles into a number of clusters based on some predefined metrics such as velocity, distance and location. In this paper, a clustering routing protocol, named QMM-VANET, which considers Quality of Service (QoS) requirements, the distrust value parameters and mobility constraints, is proposed. This protocol specifies a reliable and stable cluster and increases the stability and connectivity …