If you want to connect cars in like smart city/roads/self-driving, as i.e. "let's keep that speed so traffic is as effective as possible etc", then you do not n

If you want to connect cars in like smart city/roads/self-driving, as i.e. "let's keep that speed so traffic is as effective as possible etc", then you do not need any "cloud" - peer-to-peer is as effective without need for central "cloud". Still, I do not believe anyone would easily accept any cloud connected (or cloud-like) car. First there are many other problems that humanity need to solve before jumping into such complicated matter.