1. Federal Railroad Administration, 1995. Nationwide Study of Train Whistle Bans, Federal Railroad Administration, Washington DC. Available from: .
2. Federal Railroad Administration, 2000. Updated Analysis of Train Whistle Bans, Federal Railroad Administration, Washington DC. Available from: .
3. Gent, S.J., Logan, S., Evans, D., 1998. Evaluation of an Automated Horn Warning System at Three Highway-Railroad Grade Crossings in Ames, Iowa. Avalable from: .
4. Zador, P.L., 2003. Analysis of the Safety Impact of Train Horn Bans at Highway-Rail Grade Crossings: Final Report, Federal Railroad Administration, Washington DC.