computer science

SUBE card

SUBE card is a computer 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 SUBE card rather than just read about it. In short: The Sistema Único de Boleto Electrónico (Unique Electronic Ticket System, mostly known for its acronym SUBE) is a contactless smart card system introduced in Argentina in February 2009. It is used on public transport services within the Buenos Aires metropolitan area and other Argentine cities and was promoted by the Argentine Secretary of Transportation.

Key takeaways

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

Reference excerpt

The Sistema Único de Boleto Electrónico (Unique Electronic Ticket System, mostly known for its acronym SUBE) is a contactless smart card system introduced in Argentina in February 2009. It is used on public transport services within the Buenos Aires metropolitan area and other Argentine cities and was promoted by the Argentine Secretary of Transportation. It is valid on a number of different travel systems across the city including the Underground, buses and trains. One of the benefits of this change is that it has helped speed passengers onto the bus, as people no longer had to wait to be issued a printed receipt as they each enter the bus. Environmentally this helps reduce emissions of carbon dioxide and nitrogen because buses don't have to stay idle as long while passengers load, helping improve air quality in the city. The electronic ticket also eliminated the need for printed receipts, thus lowering the amount of littering in the city. The city, in turn, no longer has to process, collect, count, and transport coinage received in payment of over 11 million trips per day.

Background Buenos Aires was affected for several years by an acute coin shortage that impacted the economy, banking, and transportation. Coins are still rationed by banks, and a thriving black market has been hoarding to sell coins illegally to retailers. Merchants have been rounding prices up or down according to the amount of change a customer actually has, or bartering, and making up the difference with a menial item. The fact that the vast majority of users need to purchase ahead sufficient credit for tickets and passes including highways tolls even for a complete month makes the SUBE card system carry a float of several million pesos which allows for financial backing of various activities at local government level and also, it took too much time for the customers to pay with coins in a rushing city with millions of people. The system is administered by Banco de la Nacion Argentina.

Use

The SUBE card can be used on several transports method, including Greater Buenos Aires area Buses, Trains, Buenos Aires Metro, and several toll roads. Furthermore, the system has expanded to the major cities of Argentina: among others Mar del Plata, Villa Gesell, La Costa Partido, Pinamar, Bahía Blanca, Corrientes, Neuquén, Río Grande, Ushuaia, Formosa, San Salvador de Jujuy, Paraná and Santa Fe,

Bus

According to official SUBE website it can be used in all national, province and municipal buses lines within Greater Buenos Aires Area. Here is the full list:

National Lines 1, 2, 4, 5, 6, 7, 8, 9, 10, 12, 15, 17, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 32, 33, 34, 37, 39, 41, 42, 44, 45, 46, 47, 49, 50, 51, 53, 55, 56, 57, 59, 60, 61, 62, 63, 64, 65, 67, 68, 70, 71, 74, 75, 76, 78, 79, 80, 84, 85, 86, 87, 88, 91, 92, 93, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 117, 118, 123, 124, 126, 127, 128, 129, 130, 132, 133, 134, 135, 136, 140, 143, 146, 148, 150, 151, 152, 153, 154, 158, 159, 160, 161, 163, 165, 166, 168, 169, 172, 174, 175, 176, 177, 178, 179, 180, 181, 182, 184, 185, 188, 193, 194, 195.

Province Lines 200, 202, 203, 204, 205, 214, 215, 218, 219, 222, 228, 236, 237, 238, 239, 242, 243, 245, 247, 252, 253, 256, 257, 263, 264, 266, 269, 271, 273, 275, 276, 277, 278, 281, 283, 284, 288, 289, 291, 293, 295, 297, 298, 299, 300, 304, 306, 307, 310, 311, 312, 313, 314, 315, 317, 318, 321, 322, 323, 324, 325, 326, 327, 328, 329, 333, 336, 338, 340, 341, 343, 350, 354, 355, 364, 365, 370, 371, 372, 373, 378, 379, 382, 383, 384, 385, 388, 391, 392, 394, 395, 403, 404, 405, 406, 407, 410, 418, 421, 422, 429, 430, 432, 435, 436, 437, 440, 441, 443, 445, 446, 448, 44.

Municipal Lines

Buenos Aires Underground All lines including:

Trains All the following commuter rail lines:

Tolls roads From the beginning of 2014, several tolls road could be paid by SUBE card:

Autopistas del Oeste Autopistas del Sol

Controversies The project was led by Global Infrastructure (GI), owned by the British businessman Stephen Chandler. The Argentine newspaper La Nación noted that the fiscal address of GI was that of a local hairdresser, and their employees were not actually working for GI nor receiving the informed payments. The Secretary of Transport had also chosen Global Infrastructure despite being $10,000,000 more expensive than other offerings. La Nación also pointed out that GI did not exist before the tender. When all this info came to light, the contract with GI was cancelled.

Illustrations

Worked examples

Example 1 — a first encounter with SUBE card

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

In research: SUBE card appears in computer 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 SUBE card 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: SUBE card is common in secondary-school and first-year university syllabi. It links to neighbouring topics Buenos Aires Underground, Contactless smart cards, Political scandals in Argentina, so understanding it makes those chapters shorter.
In everyday life: Look for SUBE card 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 SUBE card in 20 minutes

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

Frequently asked questions

What is SUBE card in simple terms?

Why does SUBE card matter?

Because it connects several computer 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 SUBE card?

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 SUBE card.