100% agree, except: If at all manageable, I'd upload 100% if I were Google (Or 0% if I was not). You want big data, "every car on the road" is huge data. Crowd-source street maps (They already do this with cell phones for roads, iirc), plot traffic patterns, study wild-life, get ambulances in the area before an accident even occurs, submit request tickets to cities to alter traffic laws where the traction has become a bit too low. A camera on ever corner is both a sci-fi writer's and data scientist's dream. Even if they just took the position of selling (or opening) that data, that's A+ value to a business trying to pick out the next site to expand their offices / restaurants / outlets.If I were Google, I'd set it to cache several minutes worth of data in RAM and then, if any sensor registered an anomalous event of any kind I'd write that shit to memory and upload it to the mothership