Millegan, H., Yan, X., Richards, S., Han, L., “Do stop signs improve safety at highway-railroad grade crossings?”, ITE Journal, Institute of Transportation Engineers, Washington, DCFebruary, 2010

Xuedong Y., Han, L., Richards S., Millegan, H., “Train-Vehicle Crash Risk Comparison between Before and After Stop Signs Installed at Highway-Rail Grade Crossings”, Traffic Injury Prevention, Taylor & Francis, Inc., 2010 Oct;11(5):535-42

Millegan Hal,  Xuedong Yan, Stephen Richards, and Lee Han. “Evaluation of Effectiveness of Stop-Sign Treatment at Highway–Railroad Grade Crossings”.  Journal of Transportation Safety & Security, 1:46–60, ISSN: 1943-9962 print / 1943-9970 online DOI: 10.1080/19439960902735253, 2009.

Millegan, Hal, Yan, Xuedong, Richards, Stephen, Han, Lee, " Evaluation of Effectiveness of Stop-Sign Treatment at Highway-Railroad Grade Crossings," Proceedings 88th Annual Meeting of the Transportation Research Board, The National Academies, Jan 11-15, 2009, Washington, DC., Paper No.09-0806.

Millegan, Hal, Yan, Xuedong, Richards, Stephen, Han, Lee, “Do stop signs improve safety at highway-railroad grade crossings?”, ITE Journal, Institute of Transportation Engineers, Washington, DC (February, 2010 - Pub. Date)

Millegan, Hal – Millegan, Hal, Yan, Xuedong, Richards, Stephen, Han, Lee, " Evaluation of Effectiveness of Stop-Sign Treatment at Highway-Railroad Grade Crossings," Proceedings 88th Annual Meeting of the Transportation Research Board, The National Academies, Jan 11-15, 2009, Washington, DC., Paper No.09-0806.