[mtmail]

Tracking location is enough to figure out if somebody is driving to fast compared to the local speed limit. Depends on how good the map data is but I've seen this done with public GPS tracks (https://www.openstreetmap.org/traces).

[joezydeco]

Didn't say fast, just aggressive. If you do jackrabbit starts out of a red light but stay under the limit, it's still an aggressive move and it's noticed.