1. Bak, Radoslaw and Mariusz Kiec. “Influence of Midblock Pedestrian Crossings on Urban Street Capacity.” Transportation Research Record 2316 (2012): 76–83.
2. Boodlal, Leverson. Providing Accessible Sidewalks and Street Crossings. Washington, D.C.: U.S. Department of Transportation, National Highway Administration, 2003.
3. Branyan, George. DC Experience with the HAWK—Hybrid Pedestrian Signal and Rectangular Rapid Flashing Beacons. Presentation by the District Department of Transportation.
4. City of Boulder Transportation Division. Pedestrian Crossing Treatment Warrants. Boulder: 1996.
5. City of Boulder Transportation Division. Pedestrian Crossing Treatment Installation Guidelines: Installation Guidelines. Boulder: 2011.