It'll give them very accurate information on where people are travelling from and to - much as Google Maps directions/navigation does, but on a much more precise and reliable scale.
Bear in mind that there's a completely alternative model for car ownership; with fully automated vehicles, there's no absolute requirement for people to 'buy' a car - there could be shared metropolitan resources of cars, which would arrive and pick you up 'on demand' (much like a shared taxi service, subsided by subscription)
Also, given that Google would probably know the locations of all the cars at any point in time, they could also get very, very detailed traffic flow information. This they could use to further optimize traffic - i.e. load-balancing traffic through different routes - but also this could potentially be sold to other transit agencies, or even tied to demographic data to suggest where stores should open new premises.
Probably some more ideas/data sources and uses in here that I haven't considered too :)
Bear in mind that there's a completely alternative model for car ownership; with fully automated vehicles, there's no absolute requirement for people to 'buy' a car - there could be shared metropolitan resources of cars, which would arrive and pick you up 'on demand' (much like a shared taxi service, subsided by subscription)
Also, given that Google would probably know the locations of all the cars at any point in time, they could also get very, very detailed traffic flow information. This they could use to further optimize traffic - i.e. load-balancing traffic through different routes - but also this could potentially be sold to other transit agencies, or even tied to demographic data to suggest where stores should open new premises.
Probably some more ideas/data sources and uses in here that I haven't considered too :)