Countermeasures That Work: A Highway Safety Countermeasure Guide for State Highway Safety Offices, 7th edition. Goodwin, A. H., Kirley, B., Sandt, L. S., Hall, W. L., Thomas, L. J., O'Brien, N. P., & Summerlin, D. Technical Report 811 727, National Highway Traffic Safety Administration, 2013, 2013.
Countermeasures That Work: A Highway Safety Countermeasure Guide for State Highway Safety Offices, 7th edition [pdf]Paper  bibtex   

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