01334541

Component

https://doi.org/10.3141/2256-12

http://scholar.google.com...cher&publication_year=2011

The third phase of the project on evaluation of nonintrusive technologies for traffic detection is a pooled-fund study in which field tests of selected nonintrusive sensors were conducted to determine their accuracy for volume, speed, and classification by length and by axle configuration. Sensors were evaluated in a variety of traffic and environmental conditions at two freeway test sites, with additional tests performed at both signalized and unsignalized intersections. Emphasis was placed on urban traffic conditions, such as heavy congestion, and varying weather and lighting conditions. Although previous tests evaluated sensors’ volume and speed accuracy, the current generation of nonintrusive sensors introduces robust classification capabilities. New technologies, such as ground-mounted laser sensors and improved radar, contribute to this improved performance. Overall, the sensors performed better than their counterparts in previous phases of research for volume and speed accuracy. However, the additional classification capabilities had mixed results. The length-based sensors were generally able to report vehicle lengths within their tolerances, and the axle-based sensors provided accurate interaxle measurements, but significant errors were found in relating these data with a standardized classification scheme, such as FHWA’s 13-class scheme. Agencies must perform independent analysis of their classification schemes to determine whether nonintrusive sensors will provide acceptable results.

01362484

11-1952

English

pp 95-103

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309222921

Print

Figures (5) ; Photos (1) ; References (3)

Evaluation and assessment; Field tests; Sensors; Technological innovations; Traffic speed; Traffic volume; Vehicle detectors

Non-intrusive detectors

Data and Information Technology; Highways; Operations and Traffic Management; I70: Traffic and Transport

TRIS, TRB

Feb 17 2011 5:59PM

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