Evaluation Of Sensys Wireless Vehicle Detection System: Results From Adverse Weather Conditions

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

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https://hdl.handle.net/2142/45842 Copy

Description

Title

Evaluation Of Sensys Wireless Vehicle Detection System: Results From Adverse Weather Conditions

Author(s)

• Medina, Juan C.
• Benekohal, Rahim F.
• Hajbabaie, Ali

Issue Date

2011-03

Keyword(s)

Sensys wireless system, signalized intersection, magnetometer detector, rail highway crossing sensors, loop detectors, adverse weather, rain, snow

Abstract

The performance of the Sensys wireless vehicle detection system was evaluated under adverse weather conditions (winter and rain) at a signalized intersection and in close proximity to the railroad tracks at a grade crossing. At the intersection stop bar zones, the overall frequency of false calls due to vehicles in the adjacent lanes ranged from 7.7% to 15.4% per lane in the winter data and between 2.6% and 6.2% in the rain data. In addition, the frequency of multiple activations due to a single vehicle (flickering false calls) ranged from 4.2% to 7.2% in the winter data and from 5% to 7.7% in the rain data. There were only seven stuck-on calls, two missed calls, and no dropped calls. At the intersection advance zones, frequency of missed vehicles traveling between the lanes ranged between 0.4% and 5.4% in the winter condition, and between 0.8% and 9.7% in the rain condition. A low percentage of vehicles traveling inside the marked lane (0%-1.2% per lane) were missed. False calls ranged on average from 1% to 4%. No stuck-on calls or dropped calls were found at the advance zones. At the railroad grade crossing, the trains generated multiple activations in the Sensys detectors as they passed the crossing. After they departed, the sensors terminated the activations except in a few cases, where the calls remained stuck-on for periods of time. In addition, false calls were the most common type of detection error, which represented 56% to 60% of the total number of calls in the left-turn lane, and 13% to 14% in the through lane. Most of the false calls in the left-turn lane were caused by vehicles traveling in the opposing direction.

Series/Report Name or Number

FHWA-ICT-11-081

ISSN

0197-9191

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/45842

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

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