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Straight-line diagram

Straight-line diagram 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 Straight-line diagram rather than just read about it. In short: A straight-line diagram (abbreviated SLD) is a diagram of a road where the road is shown as a straight line. Such diagrams are usually produced by a highway department, and display features along the road, including bridges and intersecting roads.

Straight-line diagram — main illustration
Straight-line diagram — illustration

Key takeaways

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

Reference excerpt

A straight-line diagram (abbreviated SLD) is a diagram of a road where the road is shown as a straight line. Such diagrams are usually produced by a highway department, and display features along the road, including bridges and intersecting roads. Rows below the diagram show data about the road, usually including speed limit, number of lanes, bridge numbers, and historical data, among other data. Subway lines also frequently employ straight-line diagrams. An internal SLD viewing system may also include links to other internal data, including photos or plans. Public SLDs are distributed in formats including PDF and TIFF. Straight-line diagrams were historically used in transportation planning but have been supplanted for these purposes by geographic information systems. A strip map is a road map laid out similarly to a straight-line diagram, featuring the same details found in more conventional road maps rather than technical details. In the United States, some strip maps are distributed by state highway departments. In Australia, strip maps are distributed by state automobile associations. In the early 20th century, scrolling strip maps were also a component of some forerunners to satellite navigation devices. One wristwatch introduced in 1927 came with strip maps to be scrolled by hand. The 1932 Iter-Avto was a car-mounted device that scrolled the strip map automatically based on dead reckoning with the speedometer.

Gallery

See also Ammassalik wooden maps Gantt chart Schematic Timeline

References

External links

Colorado Department of Transportation SLDs Florida Department of Transportation SLDs New Jersey Department of Transportation SLDs Ohio Department of Transportation SLDs Pennsylvania Department of Transportation SLDs Index of Australian strip maps at the South Australian Royal Automobile Association website Sample South Australian RAA strip map from Adelaide to Clare

Illustrations

Straight-line diagram: This straight line diagram illustrates the stops on the Piccadilly Line, part of London's Underground.
This straight line diagram illustrates the stops on the Piccadilly Line, part of London's Underground.
Straight-line diagram: This is a more accurately rendered map of the Piccadilly Line, showing curvature and the relative distance between stops. It illustrates why straight-line maps are more useful when only the sequence of stops is relevant.
This is a more accurately rendered map of the Piccadilly Line, showing curvature and the relative distance between stops. It illustrates why straight-line maps are more useful when only the sequence of stops is relevant.
Straight-line diagram illustration

Worked examples

Example 1 — a first encounter with Straight-line diagram

Start with the simplest possible case. Write down what Straight-line diagram 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 Straight-line diagram 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 Straight-line diagram 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 Straight-line diagram

In research
Straight-line diagram 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 Straight-line diagram 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
Straight-line diagram is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diagrams, Streets and roads, Types of map, so understanding it makes those chapters shorter.
In everyday life
Look for Straight-line diagram 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 Straight-line diagram in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Straight-line diagram 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 Straight-line diagram out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Straight-line diagram in simple terms?

A straight-line diagram (abbreviated SLD) is a diagram of a road where the road is shown as a straight line. Such diagrams are usually produced by a highway department, and display features along the road, including bridges and intersecting roads.

Why does Straight-line diagram 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 Straight-line diagram?

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 Straight-line diagram.

Tags

  • Diagrams
  • Streets and roads
  • Types of map

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