University of Illinois Urbana-Champaign

Evaluation of Sensys Wireless Detection System: Year-After Evaluation and Off-Center Sensors

Medina, Juan; Benekohal, Rahim F.; Hajbabaie, Ali

Content Files
FHWA-ICT-11-083.pdf

Permalink

https://hdl.handle.net/2142/45834

Description

Title
Evaluation of Sensys Wireless Detection System: Year-After Evaluation and Off-Center Sensors
Author(s)
  • Medina, Juan
  • Benekohal, Rahim F.
  • Hajbabaie, Ali
Issue Date
2011-06
Keyword(s)
  • Sensys wireless system
  • signalized intersection
  • magnetometer detector
  • rail highway crossing
  • inductive loop
  • sensor relocation
Date of Ingest
2013-09-26T17:46:12Z
Abstract
This is the third and final report of the evaluation of the Sensys wireless vehicle detection system at a signalized intersection and a railroad grade crossing. It presents the system performance after one year of its initial installation, and when additional off-center sensors were installed at the stop bar zones of the signalized intersection. Results from the signalized intersection showed no significant changes one year after the system was in use, except for a decrease in the frequency of false calls due to vehicles in adjacent lanes (from a range of 5.6%-7.6%, to a range of 0.8%-2.4%). At the stop bar zones, multiple calls generated by a single vehicle remained similar (between 7% and 10.2%), and no missed, stuck-on, or dropped calls were found. Also, the detection performance at the advance zones did not change. Missed vehicles ranged between 0.6% and 6.1%, most of which were traveling between lanes, and false calls were lower than 2%. At the railroad grade crossing, the performance of the Sensys system after one year did not show significant changes. Stuck-on calls due to trains were rare and occurred at a rate of about one occurrence for every 150 trains. False calls in the left-turn lane due to vehicles in the opposite direction remained high (more than 30%, caused by trucks and smaller vehicles), and missed calls were lower than 1%. The installation of sensors off-center relative to the loop detectors at the stop bar zones of the signalized intersection (close to the leading edge of the loops), resulted in lower number of multiple calls from a single vehicle (from 7%-10.2% down to 2%-3.3%). However, it did not improve on the frequency of false calls due to vehicles in the adjacent lanes.
Series/Report Name or Number
FHWA-ICT-11-083
ISSN
0197-9191
Type of Resource
text
Genre of Resource
Technical Report
Language
en
Permalink
http://hdl.handle.net/2142/45834
Sponsor(s)/Grant Number(s)
Illinois Department of Transportation ICT R27-58
Copyright and License Information
No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161

Owning Collections

Research and Publications - Illinois Center for Transportation PRIMARY