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| | Four-Lane to Three-Lane Conversion |
 | | The Effect of Four-Lane to Three-Lane Conversion on the Number of Crashes and Crash Rates in Iowa Roads (3.3 mb *pdf) by Wen Li and Alicia Carriquiry, Iowa State University's Department of Statistics, June 2005. |
 | | The Conversion of Four-Lane Undivided Urban Roadways to Three Lane Facilities (398 kb *pdf) by Tom Welch, State Transportation Safety Engineer, Iowa Department of Transportation, presented at the TRB/ITE Urban Street Symposium, Dallas, Texas, June 28–30, 1999. |
 | | Converting Four-Lane Undivided Roadways to a Three-Lane Cross Section: Factors to Consider (230 kb *pdf) and abstract (5 kb *pdf) by Keith Knapp, presented at the 69th Annual ITE Meeting, Las Vegas, Nevada, August 1–4, 1999. |
| www.ctre.iastate.edu /research/4laneto3lane.htm (243 words) |
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