How were the earliest automatic traffic lights automated?

Upvote:6

In 1910 Ernest Sirrine had patented an automated street-traffic system that used a motor and a set of gears and pulleys to rotate signs attached to an axis.

... The cam 13 is driven at a constant speed and at a rate to suit the estimated proper speed of street traffic, and is of such a nature as to operate the arms 11 at proper intervals, this operation of these arms being simultaneous as they are linked at 16. Each time the arms 11 are operated both arms 7 and 8 are rotated about their fixed horizontal axes, whereby one arm displays one signal and the other arm displays and opposite signal each time the arms are rotated.

From that description, I guess you could say the first automated traffic light system used a mechanical timer, not synchronized with other traffic lights, but displaying opposite signals on both sides.

vadkou 201

📝 Why were Royal Navy ships forbidden to attack the ARA Veinticinco de Mayo in Argentinian waters?
📝 What was entering Grand Central Station like in 1943, especially interior?
📝 What is that gold plaque Scottish soldiers wore around their necks?
📝 What family or other connection bound Chiang Kaishek and Cai Yuanpei, two ideological opposites?
📝 Did the Romans have writing desks?
📝 How many electric light companies operated in New York in 1887?
📝 How can we be certain of customs in the primitive age?
📝 Why did JFK give approval for the CIA to encourage Diem's deposal?
📝 What was housing like in early Medieval Scotland?
📝 What are some instances of professional army funding being stolen in full?
📝 What are this tunic and badge?
📝 Who was the first monarch?
📝 Were defendants at the Nuremberg trial allowed to deny the holocaust?
📝 How much firepower did the British navy represent in 1940?
📝 How historically accurate is Age of Empires III?
📝 When and why was the samurai class abolished?
📝 Why did Teddy Roosevelt have his second wedding in London?
📝 Pre-Christian use of the Greek Septuagint
📝 What caused the rapid African population growth in the last decades?
📝 Why did Henry I imprison his older brother and rival Robert for almost 30 years instead of having him killed?
📝 How did cities operate in medieval times?
📝 Is there a reason for a Queen's husband not to be referred to as King?
📝 Were the ancestors of Malays originally from Yunnan, China?
📝 Where can I find reliable primary sources written by Ancient Egyptian laborers?
📝 What access did people in the Warsaw pact countries have to Western television and radio?
📝 Did Truman play the piano in Potsdam to annoy Churchill with Chopin?
📝 WW1 shell case markings
📝 Why did Americans oppose Richard Nixon's visit to China? What "past policies" were Nixon going against?
📝 Was Red Orchestra led by Jews?
📝 What was life expectancy in early medieval Britain?

Source: stackoverflow.com

Travel Tips

Search Posts

📝 How were the earliest automatic traffic lights automated?
📝 What were traffic lights like in the USSR?
📝 What were the characteristics of the earliest varieties of European cattle, "bos tauros", and how were they kept?
📝 How were smallpox vaccines enforced in the US?
📝 How severe were the casualties in ancient/medieval battles?
📝 How kind were the Muslim occupations of North Africa?
📝 How were the cities of Milan and Bruges spared by the Black Death?
📝 How beneficial were war bonds to the US during WWII
📝 How prevalent were recreational drugs in the ancient world?
📝 How were Kurds involved (or not) in the invasion of Normandy?
📝 How much were telegraphists in the 1950s paid?
📝 How unfavorable were the terms of Germany's "surrender" in WW1?
📝 How heavily were the British taxing their American colonies?
📝 How many lives were estimated to have been saved by the Hiroshima and Nagasaki bombs?
📝 Why were so many of the earliest banks founded by cloth merchants?
📝 How expensive were castles? And how were the costs distributed?
📝 How far were women able to advance in the Gestapo?
📝 How come all the major WW1 rifles were bolt action?
📝 Were bookshops 'common' in the late 19th century, and how did they differ from modern ones?
📝 About how many immigrants were on the Titanic?
📝 How were the West Berlin air corridors negotiated?
📝 How accurate and detailed were geographical maps created and updated by the Romans?
📝 How were small swords worn in the 18th century?
📝 How educated were the clergy during the Medieval period?
📝 How were the Bulgarians regarded by the Nazis during World War II?
📝 How were servants to the Kaiser of Imperial Germany treated and where may I find more information on them?
📝 How frequently were homing pigeons used in the World Wars?
📝 How rich were carpenters in Roman Galilee in the 1st century AD?
📝 How were the British and French armies invited into Belgium in 1914?
📝 How did people say “I have to go to the bathroom” before the bathroom and pipes were common?

How were the earliest automatic traffic lights automated?

More post

Search Posts

Related post