This paper presents the design, development, implementation, and testing of a Cooperative Adaptive Cruise Control (CACC) system. The system improves upon traditional Adaptive Cruise Control (ACC) by incorporating vehicle-to-vehicle (V2V) communication, allowing vehicles to share information and enhance traffic flow and safety. The CACC system consists of two controllers: one for managing the approach to the leading vehicle and another for regulating car-following once the vehicle joins the platoon. The system was implemented on four production Infiniti M56 vehicles equipped with 5.9 GHz DSRC for wireless communication. The CACC system uses wireless communication to provide additional information, enabling tighter control of vehicle spacing and improving string stability. This allows for significantly shorter time-gap settings than traditional ACC systems, which are comfortable and acceptable to drivers. The system was tested in real traffic scenarios to compare its performance with the commercially available ACC system. The results showed that the CACC system significantly improved traffic flow and safety, reducing congestion on highways and improving driver confidence. The CACC system was tested in various scenarios, including gap setting changes, cut-in and cut-out maneuvers, and four-vehicle tests. The results demonstrated that the CACC system outperformed traditional ACC systems in terms of response time, string stability, and traffic flow efficiency. The system was able to handle complex situations such as sudden cut-ins and cut-outs, maintaining stable performance and reducing the risk of accidents. The CACC system has the potential to significantly improve traffic efficiency and safety by reducing disturbances in traffic flow and improving highway capacity. Ongoing research focuses on assessing the potential magnitude of improvements that a CACC system might have on traffic response, both with respect to ACC and as a function of market penetration. The study highlights the importance of V2V communication in enhancing traffic safety and efficiency, and the potential of CACC systems to revolutionize intelligent transportation systems.This paper presents the design, development, implementation, and testing of a Cooperative Adaptive Cruise Control (CACC) system. The system improves upon traditional Adaptive Cruise Control (ACC) by incorporating vehicle-to-vehicle (V2V) communication, allowing vehicles to share information and enhance traffic flow and safety. The CACC system consists of two controllers: one for managing the approach to the leading vehicle and another for regulating car-following once the vehicle joins the platoon. The system was implemented on four production Infiniti M56 vehicles equipped with 5.9 GHz DSRC for wireless communication. The CACC system uses wireless communication to provide additional information, enabling tighter control of vehicle spacing and improving string stability. This allows for significantly shorter time-gap settings than traditional ACC systems, which are comfortable and acceptable to drivers. The system was tested in real traffic scenarios to compare its performance with the commercially available ACC system. The results showed that the CACC system significantly improved traffic flow and safety, reducing congestion on highways and improving driver confidence. The CACC system was tested in various scenarios, including gap setting changes, cut-in and cut-out maneuvers, and four-vehicle tests. The results demonstrated that the CACC system outperformed traditional ACC systems in terms of response time, string stability, and traffic flow efficiency. The system was able to handle complex situations such as sudden cut-ins and cut-outs, maintaining stable performance and reducing the risk of accidents. The CACC system has the potential to significantly improve traffic efficiency and safety by reducing disturbances in traffic flow and improving highway capacity. Ongoing research focuses on assessing the potential magnitude of improvements that a CACC system might have on traffic response, both with respect to ACC and as a function of market penetration. The study highlights the importance of V2V communication in enhancing traffic safety and efficiency, and the potential of CACC systems to revolutionize intelligent transportation systems.