Vehicular Ad Hoc Networks (VANETs) belong to a distinct classification of wireless ad hoc networks. These networks are a subset of MANET networks used to communicate in ITS systems. Like MANET, VANETs do not have a specific structure, and the network nodes represent moving vehicles. The driver's decision, high speed, and continuous movement of cars have imposed unique characteristics on these networks. There are also new challenges, such as scalability, data routing, information broadcasting, QoS, and security. The rapid velocity of vehicles results in a significant frequency of VANET topology alterations. At the same time, the slow acceleration of cars can result in a substantial traffic concentration and an elevated likelihood of data collisions, leading to congestion. This paper proposes a new strategy for data congestion control. Upon identifying the network congestion, the proposed method resolves the congestion by emphasizing the minimal rate of the loss of packets (the quantity of dropped packets) by solving the optimization problem. In fact, after modelling the congestion and solving the problem, the data transmission rate is determined to minimize packet loss. The proposed method is compared with prominent data congestion control methods in networks such as CSMA/CA to evaluate the performance. The evaluation parameters include the network service quality, including the number of lost packets, throughput, and delay. The evaluation results indicate improvement in the network.