The following references on road diets were provided by Randy Dittberner, P.E., PTOE at VDOT. The lane reduction proposal for Lawyers Road is known as a road diet.
The Transportation Research Board periodically publishes a report that summarizes expected changes in crash patterns when various improvements are implemented.
The following link leads to the most recent of these publications, published in 2008, in which road diets are discussed on page 21 and the results tabulated on page 61.
http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rpt_617.pdf
The following link leads to a 2001 report by the Center for Transportation Research and Education at Iowa State University, outlining recommended guidelines where road diets might be appropriate.
http://www.intrans.iastate.edu/reports/4to3lane.pdf
The above publication was updated twice, first in 2003 and again in 2007; the following links lead to the relevant reports.
http://www.urbanstreet.info/2nd_sym_proceedings/Volume%202/Knapp.pdf
http://www.urbanstreet.info/3rd_symp_proceedings/Four-Lane%20to%20Three-Lane.pdf
Additional information about road diet experience in Iowa was reported in a 2001 publication at the following link:
http://www.urbanstreet.info/1st_symp_proceedings/Ec019_f4.pdf
The following link leads to a 1999 article by Dan Burden, a nationally recognized expert in pedestrian and bicycle accommodations. It includes an extensive summary of the impacts of some of the road diets that had been implemented in several jurisdictions at the time the article was published.
http://www.walkable.org/assets/downloads/roaddiets.pdf

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