Then-ex-Fed-Ex? You present more details than the article does and I cannot find additional information. I happened to see this:
Who's responsible when an autopilot car crashes? | WMDT.com Maryland-Delaware
All that it really says is Google does not have a steering wheel or pedals in its cars, but it is still testing the technology.
Couldn't they put transponders in each corner? No identifiable information, just "Front-left corner?" How far would that need to reach, a couple hundred feet? Then they always know where other [equipped] vehicles are.