Volume Shadows and Jam Classification


The sensor network run by Caltrans (PeMS) doesn’t just record the speeds of cars going over each sensor throughout the day, it also records how many cars pass over the sensors, the “volume” of cars. In this post we explore how volume measurements show how we can differentiate between congestion-induced traffic jams (jams caused by a large number of cars on the freeway at once) and incident-induced jam (jams caused by something like an accident). Here’s 101 North From Palo Alto. The sensors in the charts below are shown on the map: Location of Charted…

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