_{^{traffic flow detection: real-time traffic flow detection(vehicle speed, vehicle 
              speed, vehicle type, existence time); traffic flow datastatistics(vehicle type     Analyzer   flow     statistics, average speed, average length, occupancy, gap       distance);         real-time traffic  flow superposition function(VTD3400 does not has the  function);
                        
                              
                        Traffic incident detection: vehicle behavior incident  detection (stopped     vehicle,   changing line, vehicle converse ,  congestion); Road state  incident detection( spilled things, obstacle); Non-motorized vehicle incident 
                         detection(pedestrian); visibility detection( smoke, fogs)}} 

                          _{^{Automatic video recording and data backup: traffic incident
                           automatic video recording; traffic flow data backup; video
                            recording data backup.}}         

          
                                             _{^{detection zone, detection parameter configuration
                                             real-time traffic flow data superposition display
                                             traffic flow statistical data display
                                             real-time traffic incident alarm, picture switch
Management machine    traffic incident inquiry
                                             analyzer management}}