engineering

Sam Schwartz

Sam Schwartz 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 Sam Schwartz rather than just read about it. In short: Samuel I. Schwartz, also known as Gridlock Sam, is an American transportation engineer, formerly the New York City Traffic Commissioner, notable for popularizing the phrase "gridlock".

Key takeaways

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

Reference excerpt

Samuel I. Schwartz, also known as Gridlock Sam, is an American transportation engineer, formerly the New York City Traffic Commissioner, notable for popularizing the phrase "gridlock".

Life and career After graduating from Brooklyn Technical High School in 1965, Schwartz was educated at Brooklyn College (BS Physics) and the University of Pennsylvania (MSCE), and first worked as a New York City cabbie before being hired by the City of New York in 1971. He served as NYC Traffic Commissioner from 1982 to 1986, and when the traffic department became subsumed by the Department of Transportation he held the second-in-command post of First Deputy Commissioner and Chief Engineer from 1986-1990. While employed with the city, he tried to ban cars from Midtown Manhattan but the project was aborted just before implementation by then-Mayor John Lindsay. He also introduced the first physically separated bike lanes on city streets on 4 Manhattan Avenues (5th, 6th, 7th and Broadway) in 1980. The project was short lived as Mayor Ed Koch ordered him to remove them after only 6 weeks. He earned the nickname Gridlock Sam during the 1980 transit strike when he developed a series of transportation contingency plans, called the Grid-Lock Prevention Program. It was under Schwartz's watch that the city almost became the first city to implement congestion pricing. The city's bridges had not been tolled since 1911 and beginning in 1973 he worked with Mayor Lindsay to reintroduce them. Even with a change in leadership (Mayor Lindsay was replaced by Abe Beame in 1974) it looked like the tolls would be reinstated. However, an act of Congress nixed the proposal in 1977. Congestion pricing was eventually introduced in 2025. After he left city government in 1990, he started his own firm. He wrote columns for New York City's Daily News, lower Manhattan’s Downtown Express, The Queens Chronicle and in the Yiddish News Report as Gridlock Shmuel. In 2025 he donated more than $1 million to Roosevelt House Public Policy Institute at Hunter College to start a Transportation Research Program where he serves as Board Chair.

References

External links Gridlock Sam website at the Wayback Machine (archived July 11, 2011)

Illustrations

Worked examples

Example 1 — a first encounter with Sam Schwartz

Start with the simplest possible case. Write down what Sam Schwartz 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 Sam Schwartz 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 Sam Schwartz 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 Sam Schwartz

In research: Sam Schwartz 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 Sam Schwartz 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: Sam Schwartz is common in secondary-school and first-year university syllabi. It links to neighbouring topics American civil engineers, American columnists, American taxi drivers, so understanding it makes those chapters shorter.
In everyday life: Look for Sam Schwartz 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 Sam Schwartz in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sam Schwartz means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Sam Schwartz out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sam Schwartz in simple terms?

Samuel I. Schwartz, also known as Gridlock Sam, is an American transportation engineer, formerly the New York City Traffic Commissioner, notable for popularizing the phrase "gridlock".

Why does Sam Schwartz 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 Sam Schwartz?

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 Sam Schwartz.