Abbreviations
ACB — American Council of the Blind
ADAAG — ADA Accessibility Guidelines
ADA — Americans with Disabilities Act
AER — Association for Education and Rehabilitation of the Blind and Visually Impaired
AGC — automatic gain control
CAC — citizens advisory committee
CBD — central business district
CDC — Center for Disease Control and Prevention
DOJ — Department of Justice
FHWA — Federal Highway Administration
GPS — global positioning system
LED — light-emitting diode
MMU — malfunction management unit
MUTCD — Manual on Uniform Traffic Control Devices for Streets and Highways
NCUTCD — National Committee on Uniform Traffic Control Devices
NEMA — National Electrical Manufacturers Association
NFB — National Federation of the Blind
NPRM — Notice of Proposed Rulemaking
O&M — orientation and mobility
Pedheads — pedestrian signal heads
PROWAAC — Public Rights-of-Way Access Advisory Committee
PROWAG — Public Rights-of-Way Accessibility Guidelines
PUFFIN — Pedestrian user-friendly intelligent crossing
RTOR — right turn on red
TEA-21 — Transportation Equity Act for the 21st Century
TWSI — tactile walking surface indicator
USDOT — U.S. Department of Transportation
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