1. Theo Petrisch, “The Truth about Lane Widths,” The Pedestrian and Bicycle Information Center, accessed June 6, 2016, http://www.pedbikeinfo.org/data/library/details.cfm?id=4348
2. Research suggests that lane widths of less than 12 feet on urban and suburban arterials do not increase crash frequencies.
Ingrid Potts, Douglas W. Harwood, and Karen R. Richard, “Relationship of Lane Width to Safety on Urban and Suburban Arterials,” (paper presented at the TRB 86th Annual Meeting, Washington, DC, January 21–25, 2007): 1–6.
3. Eric Dumbaugh and Wenhao Li, “Designing for the Safety of Pedestrians, Cyclists, and Motorists in Urban Environments.” Journal of the American Planning Association 77 (2011): 70.
4. Previous research has shown various estimates of relationship between lane width and travel speed. One account estimated that each additional foot (0.3 m) of lane width related to a 2.9 mph (4.7 km/h) increase in driver speed.
Kay Fitzpatrick, Paul Carlson, Marcus Brewer, and Mark Wooldridge, “Design Factors That Affect Driver Speed on Suburban Arterials,” Transportation Research Record: Journal of the Transportation Research Board 1751 (2000):18–25.