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1Academic Journal
المؤلفون: Clampitt, Jannell E., Perez, Michael A., Blake Whitman, J., Donald, Wesley N., LaMondia, Jeffrey J., Craig, Andrew J.
المصدر: Transportation Research Record: Journal of the Transportation Research Board ; volume 2677, issue 7, page 249-264 ; ISSN 0361-1981 2169-4052
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2Academic Journal
المساهمون: the Iowa Department of Transportation
المصدر: Transportation Research Record: Journal of the Transportation Research Board ; volume 2675, issue 6, page 281-293 ; ISSN 0361-1981 2169-4052