A vehicular ad hoc network (VANET) represents an advanced version of MANET. It has a distinctive kind of tasks and prospects for routing protocols according to the high vehicles speed, the roads limitations, traffic rules, and transmission connectivity. Based on these technical and management issues, developed valid algorithms and significant solutions are important for VANET's environment. Clustering is to create a vehicles network more reliable and scalable by combining the moving vehicles on certain street in a topographical district as a group. Clustering is a robust tool in enhancing the reliability and the scalability of routing in VANETs. Combining vehicles in a group may create a hierarchical network with certain distributed formation built on their relative velocity and related local longitudinal distribution. A comprehensive VANET's clustering overview is presented in this review article. The proposed choices of the developed clustering algorithms with their problems and suggested solutions are also presented in a taxonomy manner.