Traffic & safety:
Fitzpatrick, Kay, P.E., Paul J. Carlson, P.E., Mark D. Wooldridge, P.E., and Marcus A. Brewer. Project Summary Report 1769-S: Project 0-1769: Identify Design Factors That Affect Driver Speed and Behavior. Texas Transportation Institute in cooperation with the Texas Dept of Transportation and the U.S. Dept of Transportation, Federal Highway Administration. Retrieved from https://d2dtl5nnlpfr0r.cloudfront.net/tti.tamu.edu/documents/1769-S.pdf
Harwood, Douglas W. (August 1990). Effective Utilization of Street Width on Urban Arterials. Transportation Research Board. Retrieved from http://onlinepubs.trb.org/Onlinepubs/nchrp/nchrp_rpt_330.pdf
Jaffe, Eric. (July 28, 2015). 10-Foot Traffic Lanes Are Safer—and Still Move Plenty of Cars. CityLab. Retrieved from https://www.citylab.com/solutions/2015/07/10-foot-traffic-lanes-are-saferand-still-move-plenty-of-cars/399761/
Mann, Adam. (June 17, 2014). What’s Up With That: Building Bigger Roads Actually Makes Traffic Worse. Wired. Retrieved from https://www.wired.com/2014/06/wuwt-traffic-induced-demand/
Noland, Robert B. (2003). Traffic Fatalities and Injuries: The Effect of Changes in Infrastructure and Other Trends. Accident Analysis & Prevention 35(4), 599-611. Retrieved from http://dx.doi.org/doi:10.7282/T3736T9J
Potts, Ingrid B., Douglas W. Harwood, and Karen R. Richard. (2007). Relationship of Lane Width to Safety for Urban and Suburban Arterials. Midwest Research Institute. Retrieved from https://www.smartgrowthamerica.org/app/legacy/documents/cs/resources/lanewidth-safety.pdf
Surface Transportation Policy Project. (November 1999). Why Are the Roads So Congested? A Companion Analysis of the Texas Transportation Institute’s Data On Metropolitan Congestion. Retrieved from http://transact.org/wpcontent/uploads/2014/04/Why_Are_Roads_So_Congested.pdf
Burden, Dan. (Summer 2006). Urban Street Trees: 22 Benefits, Specific Applications. Walkable Communities, Inc. Retrieved from http://www.michigan.gov/documents/dnr/22_benefits_208084_7.pdf
Federal Highway Administration (FHWA). Context Sensitive Design / Context Sensitive Solutions. FHWA Publication No: FHWA-RC-BAL-04-0015.
Neuman, Timothy R., Marcy Schwartz, Leofwin Clark, and James Bednar. (2002). NCHRP Report 480: A Guide to Best Practices for Achieving Context Sensitive Solutions. Transportation Research Board. Retrieved from http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rpt_480.pdf
NCDOT. (September 8, 2003). NCDOT Context Sensitive Solutions: Goals and Working Guidelines. Retrieved from https://www.ncdot.gov/programs/environment/development/solutions/pdf/CSSGuidelines.pdf
Vermont Agency of Transportation. (October 22, 1997). Vermont State Design Standards. Retrieved from http://vtrans.vermont.gov/sites/aot/files/highway/documents/publications/VermontStateDesignStandards.pdf
Ficek, Bryant, P.E., PTOE. (August 23, 2016). Roundabouts Are Not a Silver Bullet: How to Know When a Roundabout Is Not the Right Design. Retrieved from http://www.mikeontraffic.com/roundabouts-not-silver-bullet/
GHD. How To Drive Through a Roundabout: Large Trucks (with Semi-trailers). Provided via email by NCDOT.
Goel, Tarun. (July 15, 2011). Rise of the Roundabouts. Bright Hub Engineering. Retrieved from http://www.brighthubengineering.com/structural-engineering/121476-rise-of-the-roundabouts/
NCDOT. (March 2010). Your Guide To Understanding Roundabouts. Provided via email by NCDOT.
Rodegerdts, Lee, Justin Bansen, Christopher Tiesler, Julia Knudsen, and Edward Myers. (2010). NCHRP Report 672: Roundabouts: An Informational Guide, Second Edition. Transportation Research Board. Retrieved from http://nap.edu/22914