science

Redundant elevators

Redundant elevators is a science 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 Redundant elevators rather than just read about it. In short: Redundant elevators are additional elevators installed to guarantee greater accessibility of buildings and public transportation systems in the event that an elevator malfunctions or is undergoing repairs. The United States Disability Rights Education and Defense Fund describes redundant elevators as a "best practice" and recommends all transit agencies "consider installing redundant elevators at all existing key st…

Key takeaways

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

Reference excerpt

Redundant elevators are additional elevators installed to guarantee greater accessibility of buildings and public transportation systems in the event that an elevator malfunctions or is undergoing repairs. The United States Disability Rights Education and Defense Fund describes redundant elevators as a "best practice" and recommends all transit agencies "consider installing redundant elevators at all existing key stations with elevators in rapid, light, and commuter rail, and at all Amtrak stations with elevators."

Legislation

United States The Americans with Disabilities Act of 1990 requires elevators for new construction and alterations in public accommodations and commercial facilities, with some exceptions. However, there are no requirements for redundant elevators.

Redundant elevators in public transportation

Canada

Ottawa Ottawa's OC Transpo has committed to installing redundant elevators at all transfer stations and stations where alternative accessible routes cannot be provided.

United States

Bay Area Rapid Transit All Bay Area Rapid Transit stations have accessible elevators, however most stations lack redundant elevators. BART has committed to increasing elevator redundancy within its system.

Connecticut Department of Transportation Connecticut Department of Transportation policy states that at stations without redundant elevators, signage must be posted near all elevators displaying a 24-hour monitored telephone number that connects the passenger to a mobility taxi service.

MBTA

As part of a 2006 agreement between the Massachusetts Bay Transportation Authority (MBTA) and the Boston Center for Independent Living, MBTA has agreed to install redundant elevators at stations in their system.

Metropolitan Transportation Authority

Washington Metro Since 2003, the Washington Metro has required that all newly constructed stations must have redundant elevators. As of 2025, all Washington Metro stations are wheelchair accessible but the majority of stations lack redundant elevators. 23 out of 98 stations have at least one redundant elevator, with redundant elevators planned for installation at four other stations.

References

External links

Illustrations

Worked examples

Example 1 — a first encounter with Redundant elevators

Start with the simplest possible case. Write down what Redundant elevators claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Redundant elevators 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 Redundant elevators 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 Redundant elevators

In research: Redundant elevators appears in science 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 Redundant elevators 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: Redundant elevators is common in secondary-school and first-year university syllabi. It links to neighbouring topics Accessibility, Disability rights, Elevators, so understanding it makes those chapters shorter.
In everyday life: Look for Redundant elevators 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 Redundant elevators in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Redundant elevators 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 Redundant elevators out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Redundant elevators in simple terms?

Why does Redundant elevators matter?

Because it connects several science 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 Redundant elevators?

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 Redundant elevators.