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Journal of Sensors
Volume 2015, Article ID 685786, 8 pages
Research Article

Low-Cost and Energy-Saving Wireless Sensor Network for Real-Time Urban Mobility Monitoring System

John A. Reif, Jr. Department of Civil and Environmental Engineering, New Jersey Institute of Technology, 17 Summit Place, Newark, NJ 07102, USA

Received 16 April 2015; Revised 14 July 2015; Accepted 15 July 2015

Academic Editor: Fanli Meng

Copyright © 2015 Joyoung Lee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a low-cost and energy-saving urban mobility monitoring system based on wireless sensor networks (WSNs). The primary components of the proposed sensor unit are a Bluetooth sensor and a Zigbee transceiver. Within the WSN, the Bluetooth sensor captures the MAC addresses of Bluetooth units equipped in mobile devices and car navigation systems. The Zigbee transceiver transmits the collected MAC addresses to a data center without any major communications infrastructures (e.g., fiber optics and 3G/4G network). A total of seven prototype sensor units have been deployed on roadway segments in Newark, New Jersey, for a proof of concept (POC) test. The results of the POC test show that the performance of the proposed sensor unit appears promising, resulting in 2% of data drop rates and an improved Bluetooth capturing rate.