Privacy issues aside, a more interesting analysis would be to determine what percentage of car drivers do not break the law. Assuming analysis is purely on breaking speed limits, then further analysis could be done based on type of road (residential, motorway, etc), % above speed limit, number of miles spent breaking the law etc.

Correlate this data with accident black spots (insurance claims, type of accident, time of day etc).

You could even do route analysis and focus resources (e.g. a particular area has a large number of cars driving to schools and back, could a cycle/foot path help alleviate this).

This would be a fantastic set of data to get your hands on.