[danohuiginn]

Partner with somebody making the in-car direction/GPS boxes? They feed you the data on where there users are at each moment, you extrapolate route and time, and model traffic patterns.

[do those GPS boxes tell a central server where they are. can they? If it's "just" a privacy issue, the benefit of traffic monitoring would be enough to get people to sign away their location data]

Or just partner with a taxi or delivery firm: their dispatchers already do a fair amount of this monitoring manually, and they already track everything they can about what their drivers are doing. Plus B2B, so /much/ easier to charge serious fees.