1. ADOT Traffic Engineering Guidelines and Processes. (June 2015). Section 600—Traffic Signals, 640 Pedestrian Hybrid Beacon. Available at https://azdot.gov/docs/default-source/traffic-library/tgp0640-2015-06.pdf?sfvrsn=4. Accessed date: 5-9-19.
2. Highway Safety Manual;American Association of State Highway and Transportation Officials (AASHTO),2010
3. Federal Highway Administration. (2009). Manual on Uniform Traffic Control Devices and Arizona Supplement, adopted January 13, 2012.
4. Federal Highway Administration. (2011). 4(09)-14 (I)—Red clearance interval in pedestrian hybrid beacon sequence. Available at https://mutcd.fhwa.dot.gov/resources/interpretations/pdf/4_09_14.pdf.
5. Fitzpatrick, K., & Park, E. S. (2010). Safety effectiveness of the HAWK pedestrian crossing treatment. Report No. FHWA-HRT-10-042, Federal Highway Administration, Washington, DC.