Example image of eyePlorer eyePlorer map for 'Traffic light': Pedestrian crossing Amber (color) Color blindness Color code Green Red Traffic 3 (number) Vehicle J. P. Knight London Palace of Westminster Railway signal Semaphore Electricity Invention Lester Wire Salt Lake City Utah Cleveland Ohio Buzzer Detroit Police officer William Potts Garrett A. Morgan Ashville, Ohio Automatic Houston England Tram Stop sign Austria Israel Mexico Russia Serbia Pelican crossing United States Pedestrian Siren (noisemaker) Hearing impairment Visual impairment Pedestrian scramble Ampelmännchen East Germany Portland, Oregon Belgium France Netherlands