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Traffic signals in Philadelphia
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Yellow traffic signal
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Railroad signals in Cumberland [01]
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Railroad crossing lights at Baltimore Street
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Railroad signals in Cumberland [02]
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Traffic light at Park and Williams Streets [01]
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Traffic light at Park and Williams Streets [02]
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Traffic signal with cameras
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Older-style pedestrian crossing signs
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Signal at Branch Avenue rail yard
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Wheelock MT horn
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Woman riding motorcycle
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Georgia Avenue and Dennis Avenue
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Traffic signal communication splicing box along Great Seneca Highway [01]
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Traffic signal communication splicing box along Great Seneca Highway [02]
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Railroad signal and crossbuck [02]
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Railroad signal and crossbuck [01]
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Railroad signal and crossbuck [03]
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Traffic lights outside Greensboro station
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Railroad signal with button copy [01]
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Railroad signal with button copy [03]
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Railroad signal with button copy [02]
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Railroad signal with button copy [04]
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HAWK beacon at 16th and Jonquil Streets NW [01]
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HAWK beacon at 16th and Jonquil Streets NW [02]
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Railroad signal at Patapsco Valley State Park [01]
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Railroad signal at Patapsco Valley State Park [02]
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Halethorpe MARC station [01]
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Halethorpe MARC station [02]
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Edwards chime
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Traffic light in Bala Cynwyd
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Wheelock 7002 at a Comfort Inn [01]
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Photographing a fire alarm
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Wheelock 7002 at a Comfort Inn [02]
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Wheelock 7002T with projector device
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Railroad crossing signal at Route 608 [02]
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Railroad crossing signal at Route 608 [01]
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Railroad crossing signal at Route 608 [03]
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Vintage US&S railroad signals [01]
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Vintage US&S railroad signals [03]
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Vintage US&S railroad signals [02]
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Vintage US&S railroad signals [04]
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Wheelock 7002T at 18310 Montgomery Village Avenue [01]
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Wheelock 7002T at 18310 Montgomery Village Avenue [02]
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Wheelock fire alarm bell at 18310 Montgomery Village Avenue
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Simulated fire alarm
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7th Street and Independence Avenue SW
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Traffic signal on 7th Street SW
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Interlocking signal at Sheppard-Yonge
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Wheelock fire alarm bell
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Wheelock 7002T at Habitat ReStore
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Interlocking signal at 72nd Street on the Second Avenue Subway
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Traffic light at Third and Walnut Streets
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Traffic light at Second and Locust Streets [01]
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Traffic light at Second and Locust Streets [02]
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Intersection of John and Front Streets
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Standard bell at Maury Hall
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Standard horn with double projector
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Wheelock strobe at Rosslyn Center
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SpectrAlert fire alarm horn/strobe at Benjamin Franklin Middle School
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SIGNAL (RED) AHEAD
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Edwards fire bell in Crystal City Underground
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Allied Arts Building [01]
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East Main Street and Court Street
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Rosslyn tunnel portal
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Hampton Roads Bridge-Tunnel, westbound [02]
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Hampton Roads Bridge-Tunnel, westbound [03]
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Sign for Exit 268
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Metro D Route pocket track [01]
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Greenbelt interlocking
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College Park interlocking [01]
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Traffic signal in Scott Circle
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College Park interlocking [02]
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Metro D Route pocket track [02]
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Interlocking signal at Anacostia station
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Traffic light along M Street NW
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Silver Spring pocket track
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Largo Town Center interlocking
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Road sign at intersection of US 1 and Joplin and Fuller Roads
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Traffic signal at 15th and G Streets NW