• ADA Accessibility Guidelines: Detectable Warnings

State Standards

• California Regulations for Detectable Warning

City Standards

• City of Roseville (PDF: 1.6M)
• County of Sacramento (PDF: 210k)
• City of Sacramento (PDF: 857k)
• The City and County of San Francisco (PDF: 2.1M)
• Highlights from: A Study of Detectable Warning System Retrofit Installations (draft), City of Columbus, Ohio Public Service Department, Transportation Division (PDF: 120k)