DETECTING ERRONEOUS LOOP DETECTOR DATA IN A FREEWAY TRAFFIC MANAGEMENT SYSTEM

摘要: The reliability of detector data is critical to efficient and effective transportation management through a freeway traffic system (FTMS). An error detection algorithm developed for the FTMS in Seattle area. Although current includes some rudimentary checking, many failures errors remain undetected. new uses volume-to-occupancy ratios test 20-sec volume occupancy data. was tested by changing amplifier settings producing manual actuations field simulate malfunction states. produced few false alarms when under simulated conditions. It reliably identified short-pulse (hanging-off) malfunctions during simulation tests. provides relatively simple affordable improvement Washington State Department Transportation's existing screening methods.