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Traffic Light
Traffic lights, also known as traffic signals, traffic lamps, traffic semaphore, signal lights, stop lights, robots (in South Africa
Africa
and most of Africa), and traffic control signals (in technical parlance),[1] are signalling devices positioned at road intersections, pedestrian crossings, and other locations to control flows of traffic. The world's first traffic light was short lived. It was a manually operated gas-lit signal installed in London
London
in December 1868. It exploded less than a month after it was implemented, injuring[2] its policeman operator. Traffic control started to seem necessary in the late 1890s and Earnest Sirrine from Chicago patented the first automated traffic control system in 1910
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Portsmouth
Portsmouth
Portsmouth
(/ˈpɔːrtsməθ/ ( listen)) is a port city in Hampshire, England, mainly on Portsea Island, 70 miles (110 km) south-west of London
London
and 19 miles (31 km) south-east of Southampton. It has a total population of 205,400. The city forms part of the South Hampshire
Hampshire
built-up area, which also covers Southampton and the towns of Havant, Waterlooville, Eastleigh, Fareham, and Gosport. The city's history can be traced to Roman times. A significant naval port for centuries, Portsmouth
Portsmouth
has the world's oldest dry dock and was England's first line of defence during the French invasion in 1545. Special
Special
Palmerston Forts were built in 1859 in anticipation of another invasion from continental Europe
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Cleveland
Cleveland
Cleveland
(/ˈkliːvlənd/ KLEEV-lənd) is a city in the U.S. state
U.S. state
of Ohio, and the county seat of Cuyahoga County,[7] the state's second most-populous county.[8][9] Located along Lake Erie, the city proper has a population of 388,072, making Cleveland
Cleveland
the 51st largest city in the United States,[5] and the second-largest city in Ohio
Ohio
after Columbus.[10][11] Greater Cleveland
Greater Cleveland
ranked as the 32nd-largest metropolitan area in the United States, with 2,055,612 people in 2016.[12] The city anchors the Cleveland–Akron–Canton Combined Statistical Area, which had a population of 3,515,646 in 2010 and ranks 15th in the United States. The city is located on the southern shore of Lake Erie, approximately 60 miles (100 kilometers) west of the Pennsylvania
Pennsylvania
state border
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Toledo, Ohio
Toledo (/təˈliːdoʊ/) is a city in and the county seat of Lucas County, Ohio, United States.[6] Toledo is in northwest Ohio, at the western end of Lake Erie
Lake Erie
bordering the state of Michigan. The city was founded by United States
United States
citizens in 1833 on the west bank of the Maumee River, and originally incorporated as part of Monroe County, Michigan
Michigan
Territory. It was re-founded in 1837, after conclusion of the Toledo War, when it was incorporated in Ohio. After the 1845 completion of the Miami and Erie Canal, Toledo grew quickly; it also benefited from its position on the railway line between New York City
City
and Chicago. The first of many glass manufacturers arrived in the 1880s, eventually earning Toledo its nickname: "The Glass City"
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Lens (optics)
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing
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Kerosene Lamps
A kerosene lamp (also known as a paraffin lamp in some countries) is a type of lighting device that uses kerosene (paraffin) as a fuel. Invented by the Polish pharmacist Ignacy Łukasiewicz
Ignacy Łukasiewicz
in 1853, kerosene lamps have a wick or mantle as light source, protected by a glass chimney or globe; lamps may be used on a table, or hand-held lanterns may be used for portable lighting. Like oil lamps, they are useful for lighting without electricity, such as in regions without rural electrification, in electrified areas during power outages, at campsites, and on boats
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Traffic Officer
Traffic
Traffic
police or traffic officers,[1] often referred to colloquially as traffic cops, are police officers who usually wear a white hat and direct traffic or serve in a traffic or roads policing unit enforcing rules of the road. Traffic
Traffic
police include officers who patrol major roads and also police who address traffic infractions on other roads. It has been noted that:...traffic police, who are regarded as peripheral to most police forces, participate in both authoritative intervention and symbolic justice. Perhaps alone of all the assignments, traffic police are full-service police. They are different from the rest, however, because their work is limited to a particular venue — namely, public thoroughfares — and to particular people — namely, those who operate motor vehicles
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Philadelphia
Philadelphia
Philadelphia
(/ˌfɪləˈdɛlfiə/) is the largest city in the Commonwealth of Pennsylvania
Pennsylvania
and the sixth-most populous city in the United States, with an estimated population of 1,567,872[7] and more than 6 million in the seventh-largest metropolitan statistical area, as of 2016[update].[5] Philadelphia
Philadelphia
is the economic and cultural anchor of the Delaware
Delaware
Valley, located along the lower Delaware
Delaware
and Schuylkill Rivers, within the Northeast megalopolis
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Paris
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. 2 Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once. Paris
Paris
(French pronunciation: ​[paʁi] ( listen)) is the capital and most populous city in France, with an administrative-limits area of 105 square kilometres (41 square miles) and an official population of 2,206,488 (2015).[5] The city is a commune and department, and the heart of the 12,012-square-kilo
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Salt Lake City
Salt Lake City
Salt Lake City
(often shortened to Salt Lake and abbreviated as SLC) is the capital and the most populous municipality of the U.S. state
U.S. state
of Utah. With an estimated population of 190,884 in 2014,[7] the city is the core of the Salt Lake City
Salt Lake City
metropolitan area, which has a population of 1,153,340 (2014 estimate). Salt Lake City
Salt Lake City
is further situated within a larger metropolis known as the Salt Lake City–Ogden–Provo Combined Statistical Area
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Utah
Utah
Utah
(/ˈjuːtɔː/ YOO-taw, /-tɑː/ -tah  listen) is a state in the western United States. It became the 45th state admitted to the U.S. on January 4, 1896. Utah
Utah
is the 13th-largest by area, 31st-most-populous, and 10th-least-densely populated of the 50 United States. Utah
Utah
has a population of more than 3 million (Census estimate for July 1, 2016)
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Euclid Avenue (Cleveland, Ohio)
Euclid Avenue is a major street in Cleveland, Ohio. It runs northeasterly from the Public Square in Downtown Cleveland, through the cities of East Cleveland, Euclid and Wickliffe, to the suburb of Willoughby as a part of U.S. Route 20
U.S. Route 20
and U.S. Route 6. The street passes Playhouse Square, the University Circle, Cleveland
Cleveland
State University, the Cleveland
Cleveland
Clinic, Severance Hall, Case Western Reserve University’s Maltz Performing Arts Center (formerly The Temple Tifereth Israel ), Case Western Reserve University
Case Western Reserve University
and University Hospitals Case Medical Center
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Ohio
Ohio
Ohio
/oʊˈhaɪ.oʊ/ ( listen) is a Midwestern state in the Great Lakes region
Great Lakes region
of the United States. Ohio
Ohio
is the 34th largest by area, the 7th most populous, and the 10th most densely populated of the 50 United States. The state's capital and largest city is Columbus. The state takes its name from the Ohio
Ohio
River
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Police Constable
A constable is a person holding a particular office, most commonly in criminal law enforcement. The office of constable can vary significantly in different jurisdictions. A constable is commonly the rank of an officer within the police
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Buzzer
A buzzer or beeper is an audio signalling device,[1] which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beepers include alarm devices, timers, and confirmation of user input such as a mouse click or keystroke.Contents1 History1.1 Electromechanical 1.2 Piezoelectric2 Types2.1 Electromechanical 2.2 Mechanical 2.3 Piezoelectric3 Modern applications 4 See also 5 ReferencesHistory[edit] Electromechanical[edit] The electric buzzer was invented in 1831 by Joseph Henry. They were mainly used in early doorbells until they were phased out in the early 1930s in favor of musical chimes, which had a softer tone.[2] Piezoelectric[edit] Piezoelectric buzzers, or piezo buzzers, as they are sometimes called, were invented by Japanese manufacturers and fitted into a wide array of products during the 1970s to 1980s. This advancement mainly came about because of cooperative efforts by Japanese manufacturing companies
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Detroit
Detroit
Detroit
(/dɪˈtrɔɪt/)[6] is the most populous city in the U.S. state of Michigan, the largest city on the United States–Canada border, and the seat of Wayne County. The municipality of Detroit
Detroit
had a 2016 estimated population of 672,795, making it the 23rd-most populous city in the United States. The metropolitan area, known as Metro Detroit, is home to 4.3 million people, making it the second-largest in the Midwest
Midwest
after Chicago. Detroit
Detroit
is a major port on the Detroit
Detroit
River, one of the four major straits that connect the Great Lakes
Great Lakes
system to the Saint Lawrence Seaway. The Detroit Metropolitan Airport
Detroit Metropolitan Airport
is among the most important hubs in the United States
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