When will they be available on Google?
At first, I thought this seemed like just another set of data ripe for inclusion in Google's Universal Individual Location Tracker for Higher Ad Revenue Margins. Then I realized that they lack a good way to present the advertising specific the the car and its driver. Certainly can't send a text message or web page to the car; don't really have many dynamic signs/billboards; short-range radio "stations" along the roads have been tried (without the personalization) but failed.
Google has many, much-more effective methods for tracking people in their physical movements and their electronic/network activities -- Google and Google Maps on your cell phone with GPS/location awareness, Adsense, Analytics, Picasa, blogs, searches, ... They are already pushing ads tailored to your profile, recent searches, and current physical location.
BTW I don't believe there is currently anything preventing Google from returning search results favoring pages that display Google Ads over those that do not, or even excluding pages that contain ads from competing ad services. Several years ago, Google quietly revised many "legal" documents (e.g. Terms of Service, Privacy). You probably need to read the current versions.
For Google to be interested in this data, they would need to be pushing ads at those searching for cheating spouses, competition making sales visits to clients, and anyone curious of the lives of others -- celebrities, politicians, family, neighbors, or whatever. Even just Google Streetview has already generated some difficult questions, "Why was his car ever in our driveway at 6:00 am?"