Scaleable and Secure?
Is it even really viable in the real world?
A) Easily jammed or spoofed?
B) What if every vehicle is using it, interference?
Also GPS doesn't work if there are tall buildings etc and only Galileo might be accurate enough. But is response time fast enough?
There should be more off road testing in simulated environments. It's just cost cutting and irresponsible to test this embryonic tech on public roads.