AlltrackUSA GPS Vehicle Tracking with 'DOT Posted Speed Limit Comparison' - Plug-in Version Dont be Fooled: All Trackers tell you vehicle speed. But Ours tells you where they drove over the Posted Speed Limit !! And by how much. The Features that you want: Vehicle Location in Real Time, Speeding above the posted speed limit, 'Breadcrumb Trail'. Geofences & Alerts For Safety, Convenience & Loaded with Features Keep your driver safe by making sure they drive below the Posted Speed Limit. And keep tabs on where they are & when they arrive at their destinations. Plugs into OBDII port below dashboard on 1996 and later vehicles.