CarrollJ., & BentzenB. L. (2000). American Council of the Blind survey of signalized intersection accessibility. In GrubbD., Ed., Pedestrian safety handbook: A handbook for advocates, 2nd Ed. Washington, DC: American Council of the Blind.
2.
Healthy People2010. (n.d.). Healthy vision 2010. Retrieved September 27, 2006, from www.healthyvision2010.org