Editing Floating car data (section)

==Vehicle re-identification==
[[File:TransCore RFID reader and antenna.jpg|thumb|[[RFID]] [[E-ZPass]] reader attached to the pole and its antenna (right) used in traffic monitoring in New York City by using vehicle re-identification method]]

Vehicle re-identification methods require sets of detectors mounted along the road. In this technique, a unique serial number for a device in the vehicle is detected at one location and then detected again (re-identified) further down the road. Travel times and speed are calculated by comparing the time at which a specific device is detected by pairs of sensors. This can be done using the [[MAC address]]es from [[Bluetooth]] devices,<ref>Tarnoff, Philip John, Bullock, Darcy M, Young, Stanley E, et al. ''Continuing Evolution of Travel Time Data Information Collection and Processing'','''Transportation Research Board Annual Meeting 2009 Paper #09-2030'''
TRB 88th Annual Meeting Compendium of Papers DVD</ref> or using the [[radio-frequency identification]] (RFID) serial numbers from [[Electronic Toll Collection]] (ETC) transponders (also called "toll tags").

The ETC transponders, which are uniquely identifiable, may be read not only at [[toll road|toll]] collection points (e.g. toll bridges) but also at many non-toll locations. This is used as a method to collect [[traffic flow]] data (which is anonymized) for the [[San Francisco Bay Area]]'s [[5-1-1]] service.<ref>[http://www.bayareafastrak.org/dynamic/signup/terms.html FasTrak Application and License Agreement] {{webarchive|url=https://web.archive.org/web/20140503091454/http://www.bayareafastrak.org/dynamic/signup/terms.html |date=2014-05-03 }}, '''Toll Tags:''' section, last subsection: ''You agree that the Toll Tag may be read to provide anonymous traffic flow data to the Metropolitan Transportation Commission’s ‘511’ project, a real time traffic information service. No information identifying a FasTrak account, person or vehicle using the Toll Tag will be collected by the Metropolitan Transportation Commission or ‘511’.''</ref>

In [[New York City]]'s Midtown in Motion<ref>{{cite web|url=http://www1.nyc.gov/office-of-the-mayor/news/257-11/mayor-bloomberg-new-real-time-traffic-management-system-reduce-congestion-midtown|title=Mayor Bloomberg Announces New, Real-time Traffic Management System To Reduce Congestion In Midtown Manhattan|quote=Cameras, Microwave Motion Sensors and E-ZPass Readers Provide Real-Time Information Used in Wireless Adjustments to Traffic Signals|date=July 18, 2011|access-date=April 15, 2018|publisher=[[Government of New York City|City of New York]]|archive-date=April 16, 2018|archive-url=https://web.archive.org/web/20180416012234/http://www1.nyc.gov/office-of-the-mayor/news/257-11/mayor-bloomberg-new-real-time-traffic-management-system-reduce-congestion-midtown|url-status=dead}}</ref> program, its adaptive traffic control system also use RFID readers to track movement of [[E-ZPass]] tags as a means of monitoring traffic flow. The data is fed through the government-dedicated broadband wireless infrastructure to the traffic management center to be used in adaptive traffic control of the traffic lights.<ref>{{cite news|title=New York's award-winning traffic control system|url=http://www.itsinternational.com/sections/nafta/features/new-yorks-award-winning-traffic-control-system/|accessdate=3 May 2014|newspaper=ITS International|date=January–February 2013}}</ref>