It's much more complex than that. We're in 2013 and there are still major companies being breached within due to buffer-overflow based security exploits. Buff

It's much more complex than that. We're in 2013 and there are still major companies being breached within due to buffer-overflow based security exploits. Buffer overflows. That's just one example: there are countless of zero days exploits and, if anything, security has only been getting worse and worse, with more and more insecure technologies that we rely upon daily. What makes you think these cars are going to be secure? What makes you think the company providing the roadmap data is going to be secure? What makes you these cars are going to be running on a separate network and what makes you think that network would be secure? Regarding liability and thinking that "automakers" are going to be the one liable is an over-simplification: just look at the latest Boeing. It's back an forth between at least three companies to determine who's liable. Who is going to be reliable when there shall be a human death involving a security exploit in the OS / software stack in one of these cars? The question is not if, it's when btw.