University of Washington (UW) researchers say they have developed a low-cost way to use Wi-Fi and Bluetooth signals from bus passengers' mobile phones and devices to harness useful data.
The researchers developed sensors costing about $60 for each bus, which detected a unique identifier called a Media Access Control (MAC) address. The system only collected MAC addresses and the time and location they were detected from Bluetooth or Wi-Fi signals, and each address was anonymized for privacy protection.
The sensors mounted inside the buses initially picked up more than 20,000 unique addresses from mobile devices, so a key challenge was developing processing algorithms to filter out signals from people who were near the bus but not actually riding it. "That's probably the hardest part of the whole thing," says UW researcher Kristian Henrickson.
The researchers eliminated signals that were unreasonably long or short, or that emerged or vanished far from a bus stop, resulting in 2,800 reliable "trips."
"Let's say you have a Husky game or Seahawks game and you want to know how much demand changes so you can offer the right level of bus service for this special event," says study senior author Yinhai Wang. "If you can gather enough data from these real-time sensing systems, that's going to offer very valuable information."
From University of Washington News and Information
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