This paper is advocating for joint design of communication and control in cyber physical systems, especially self driving automobiles, exploiting adaptive and next generation networking concepts such as mobile edge clouds in 5G communication systems. In this paper, we present our'5G connectedcars' testbed that was demonstrated in multiple international events including the Mobile World Congress, Barcelona in 2016. It constitutes a complete network architecture and cloud software services that facilitates custom built miniature cars to run autonomously on a track with an intersection without collisions by using hybrid car-to-car and car-to-infrastructure communication. We tackle the latency problem in classical connected cyber physical systems by the use of mobile edge cloud in the full blown emulated 5G air interface in the cmWave band in Nokia Airframe. Finally, presenting some measurements from the testbed, we advocate for a dedicated 5G air interface for reliable and scalable steering and control, as opposed to the use of ISM bands such as IEEE802.11P.