## 6 Conclusions  
This research covered a broad spectrum of vehicular communications on VANET. We proposed authentication and communication resource-sharing algorithms for vehicular communications. We discussed previously conducted works relevant to our study in detail \begin{table}
\begin{tabular}{l c c c c c} \hline \hline  & \multicolumn{5}{c}{**Vehicle-to-Infrastructure (V2I)**} \\ \hline
**Attributes** & **1 st Request** & **2 nd Request** & **3 rd Request** & **4 th Request** & **5 th Request** \\ \hline Status (status code) & 200 & 200 & 200 & 200 & 200 \\ Response Size (bytes) & 289 & 289 & 289 & 289 & 289 \\ Socket Initialization (milliseconds) & 2.18 & 2.07 & 1.77 & 2.12 & 1.40 \\ DNS Lookup (milliseconds) & 4.11 & 3.19 & 2.95 & 2.17 & 1.62 \\ TCP Handshake (milliseconds) & 1.47 & 1.25 & 1.06 & 0.92 & 0.76 \\ Transfer Start (milliseconds) & 91.38 & 98.18 & 88.02 & 82.33 & 80.91 \\ Download (milliseconds) & 20.24 & 4.19 & 3.35 & 4.81 & 3.73 \\ \hline \hline \multicolumn{5}{c}{**Vehicle-to-Vehicle (V2V)**} \\ \hline Status (status code) & 200 & 200 & 200 & 200 & 200 \\ Response Size (bytes) & 289 & 289 & 289 & 289 & 289 \\ Socket Initialization (milliseconds) & 11.24 & 4.22 & 1.68 & 1.36 & 1.04 \\ DNS Lookup (milliseconds) & 1.19 & 0.48 & 0.77 & 0.47 & 0.89 \\ TCP Handshake (milliseconds) & 3.03 & 1.48 & 2.49 & 2.63 & 2.41 \\ Transfer Start (milliseconds) & 91.75 & 93.56 & 83.26 & 62.03 & 58.95 \\ Download (milliseconds) & 12.61 & 4.49 & 2.89 & 3.32 & 3.45 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: API Response for 5 Random HTTP Requests. Figure 8: (a) Cumulative Distribution Function (CDF) of Instantaneous Signal-to-Interference-Plus-Noise Ratio (SINR), (b) Cumulative Distribution Function (CDF) Concerning the Sum of V2I Capacity. with the help of a literature comparison table. The proposed cluster-based improved authentication and communication protocol for an Intelligent Transportation System in VANETs addresses the significant issues of traffic monitoring in overcrowded city zones. Using cluster-based routing protocols for V2V and V2I communication enhances the reliability, scalability, and stability of fast-moving VANETs. The third-party certification authority for vehicle authentication provides a secure and private mechanism for authentication. The protocols minimize the E2E delay and route request, reduce link failure, and improve the throughput, TCP Socket Initialization time, TCP handshake response, and DNS lookup. The innovative P2P wireless communication in a 400 m radius cluster minimizes the resources used, and the RESTful APIs and resource-sharing algorithms enable vehicular communication implementation. The experimental evaluation demonstrates the effectiveness of the proposed protocols in optimizing resource sharing in vehicular communication. The proposed protocol can contribute to developing more efficient and reliable Intelligent Transportation Systems in VANETs, improving traffic management, and reducing congestion in overcrowded city zones. We demonstrated our protocol and algorithms by using their corresponding behaviors and functionalities. We briefly discussed the security goals of our proposed protocol. For simulation and performance evaluation, we used MATLAB and REST APIs. We compared our results with those obtained through relevant past studies and evaluated our improved cluster-based authentication and communication protocol performance. The simulation results indicate the superior performance of our protocols and algorithms compared to other approaches. Since the 5G network diminishes the Internet speed barrier and other issues related to VANETs communication, our proposed improved cluster-based authentication and communication protocol will provide accelerated performance in V2I and V2V communications. We are also interested in developing real-world apps in the future by adopting this secure and reliable protocol. Integrating blockchain technology is one future trend in VANETs (Vehicular AdHoc Networks) urban traffic monitoring based on cluster management.