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Henry Barnes (traffic engineer)

Henry Barnes (traffic engineer) is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Henry Barnes (traffic engineer) rather than just read about it. In short: Henry A. Barnes (December 16, 1906 – September 16, 1968) was an American traffic engineer and commissioner who served in many cities, including Flint, Michigan; Denver, Colorado; Baltimore, Maryland; and New York City.

Henry Barnes (traffic engineer) — main illustration
Henry Barnes (traffic engineer) — illustration

Key takeaways

  • Henry Barnes (traffic engineer) belongs to engineering; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Henry Barnes (traffic engineer) to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Henry Barnes (traffic engineer) from memory before moving on to harder problems.

Reference excerpt

Henry A. Barnes (December 16, 1906 – September 16, 1968) was an American traffic engineer and commissioner who served in many cities, including Flint, Michigan; Denver, Colorado; Baltimore, Maryland; and New York City. Barnes was responsible for many innovations in traffic engineering, including synchronized traffic signals, actuated traffic signals (signals whose timing varies based on the presence of automobiles and pedestrians), and bus lanes.

Barnes Dance In traffic signal operation, a Barnes Dance or Barnes Shuffle is a period during which all motor vehicle traffic is stopped and pedestrians given exclusive right of way, allowing them to cross in every direction at the same time. It was first used in Kansas City and Vancouver in the late 1940s and subsequently adopted in other cities such as Denver, New York, San Diego, Baltimore, and Washington, D.C. Barnes stated that he did not invent the concept but promoted its widespread use. The phrase originated from City Hall reporter, John Buchanan, who wrote, "Barnes has made people so happy, they're dancing in the street."

Traffic Engineer and Commissioner

Flint, Michigan Barnes served in Flint until 1947.

Denver Denver city's first professional traffic engineer from 1947 to 1953, where he oversaw the conversion of Denver Tramways to bus and trolley coach.

Baltimore Barnes came to Baltimore in 1953 for a one-month job as consultant traffic engineer, but Mayor Thomas D'Alesandro, Jr. (father of Nancy Pelosi) was so impressed he hired Barnes as traffic commissioner. At Baltimore, Barnes installed a traffic-control computer that was, in 1957, the largest of its kind in the world. He had the pedestal honoring Johns Hopkins moved to Charles and 33rd Street; previously it had been responsible for a number of fatalities. Barnes asked the mayor for a raise from $18,000 to 20,000 and took the traffic commissioner position at New York City when the request was turned down.

New York City Barnes was appointed traffic commissioner to New York City on January 15, 1962, by Mayor Robert F. Wagner, and kept on by Mayor John V. Lindsay. In 1962, Barnes fought with domineering city planner Robert Moses and killed the planned elevated Lower Manhattan Expressway. In 1963, he had an idea for expanding the Long Island Expressway capacity in Queens by adding three more lanes in each direction plus a second, four-lane deck above it. The upper deck would have no exits and run inbound in the morning and outbound in the evening. The "semi-actuated signal" that allows pedestrians to influence the change of traffic lights was another idea of Barnes, thought to have been introduced in 1964. With regards to the city's traffic signals, Barnes declared to repaint all of the traffic signals throughout the city of New York in the early 1960s. Prior to the early 1960s, traffic signals throughout the city were originally dark olive green. They were repainted yellow in the early 1960s. He was also involved in the completion of converting major avenues to one-way in New York City, a project started in 1949. He reportedly suggested solving Manhattan's traffic problems by making all avenues one-way, north. Barnes endorsed the use of seat belts, built municipal parking garages and implemented widespread use of parking meters.

Recognition Barnes was featured in Life Magazine November 13, 1964, edition – "New York's traffic jam doctor". He also appeared as a "Mystery Guest #1" on the television show What's My Line? which first aired on February 18, 1962. Barnes was also featured in Popular Mechanics Magazine in January 1953. The Theodore M. Matson Memorial Award was bestowed on him in 1968. His autobiography, The Man with the Red and Green Eyes, was dedicated to his wife, Hazel M. Barnes (September 1, 1909 - September 20, 1992).

Death Barnes died in September 1968 at age 61, suffering a heart attack on the job.

Published works Autobiography – The Man with the Red and Green Eyes. Dutton. 1965. OCLC 522406. Barnes, Henry A. (November 1955). "Engineering Studies of Urban Traffic Flow". Journal of the Operations Research Society of America. 3 (4): 536–544. doi:10.1287/opre.3.4.536.

References

External links Photo – Henry Barnes (left), Charles Adler, Jr. (center), and Charles Upham, Jr. Library of Congress – Look Magazine collection of 25 photographs Photo of Barnes smoking a pipe and inspecting a parking meter, page 5

Worked examples

Example 1 — a first encounter with Henry Barnes (traffic engineer)

Start with the simplest possible case. Write down what Henry Barnes (traffic engineer) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Henry Barnes (traffic engineer) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Henry Barnes (traffic engineer) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Henry Barnes (traffic engineer)

In research
Henry Barnes (traffic engineer) appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Henry Barnes (traffic engineer) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Henry Barnes (traffic engineer) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1906 births, 1968 deaths, 20th-century American civil engineers, so understanding it makes those chapters shorter.
In everyday life
Look for Henry Barnes (traffic engineer) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Henry Barnes (traffic engineer) in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Henry Barnes (traffic engineer) means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Henry Barnes (traffic engineer) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Henry Barnes (traffic engineer) in simple terms?

Henry A. Barnes (December 16, 1906 – September 16, 1968) was an American traffic engineer and commissioner who served in many cities, including Flint, Michigan; Denver, Colorado; Baltimore, Maryland; and New York City.

Why does Henry Barnes (traffic engineer) matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Henry Barnes (traffic engineer)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Henry Barnes (traffic engineer).

Tags

  • 1906 births
  • 1968 deaths
  • 20th-century American civil engineers
  • Pedestrian activists
  • Road transportation in the United States
  • Transport engineers

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