science

Via Verde

Via Verde 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 Via Verde rather than just read about it. In short: Via Verde (literally "Green Lane") is an electronic toll collection system used in Portugal since April 1991. It is available at all toll roads and bridges in the country since 1995.

Key takeaways

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

Reference excerpt

Via Verde (literally "Green Lane") is an electronic toll collection system used in Portugal since April 1991. It is available at all toll roads and bridges in the country since 1995. Toll roads and bridges are operated by multiple operators, the main being Brisa - Auto-estradas de Portugal. Upon passing in a non-stop lane at a toll, a DSRC tag attached to the vehicle's windshield transmits its identifier and the toll amount is debited directly from the client's bank account. If an exception is detected (the tag is invalid (or non-existent) or the vehicle's class (as detected by the lane sensors) does not correspond to the class encoded in the tag, amongst others) the vehicle is photographed and, if there is indication of fraud, a legal procedure is initiated. This system provides for a good flow of traffic: usually the non-stop lanes on interchanges have a 40 or 60 km/h speed limit, tolls on the highway (as in between different tolling regions) have a 120 km/h speed limit, and the system has been proven to work at speeds above 200 km/h. The Via Verde system was the first to be universally applied to all the tolls in a country. Via Verde has gained widespread use in Portugal mainly because it can operate with any bank in the country, as there is a fully integrated cross-bank network (the SIBS network, also known as Multibanco).

Vehicle classes Via Verde/toll works with classes for the various vehicles (see Brisa classes for details).

Class 1: vehicles with a height that are below 1.10m(*), with or without trailer Motorcycles are considered class 1 in case of manual toll collection or class 5 when using Via Verde. Class 2: vehicles with two axles and a height equal or above 1.10 m(*). Class 3: vehicles with three axles and a height equal or above 1.10 m(*). Class 4: vehicles with more than three axles and a height equal or above 1.10 m(*). Some Class 2 cars are eligible for a class reduction if they are between 1100mm and 1300mm(*) tall, maximum weight is between 2300 kg and 3500 kg, can carry more than 5 passengers, and does not have 4-wheel drive. This is determined either by finding the vehicle on a pre-approved list, or by getting a special inspection. (*) Measured over the front axle (Classes de Veículos).

Alternate uses Due to the widespread use of the Via Verde, it is now being expanded to other areas outside toll fee collecting. Many carparks, some gas service stations (GALP) and even McDrive (equivalent to DriveThru) are now using it as a possible payment method. This system is fully integrated, which means one tag works everywhere. As of 2015, one McDonald's location in Lisbon accepted Via Verde as a method of payment. Via Verde is also commonly accepted in parking centres, most notably in Lisbon Airport.

Electronic toll Since 2010, some highways have used a system of electronic tolling – no manual cash or credit card payment is possible anymore. These highways can be recognized by an icon showing a car driving under some curved lines and a Euro symbol.

References

External links

Official Via Verde site Equipment supplier Archived 2012-05-04 at the Wayback Machine Brisa Road, toll and traffic information

Illustrations

Worked examples

Example 1 — a first encounter with Via Verde

Start with the simplest possible case. Write down what Via Verde 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 Via Verde 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 Via Verde 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 Via Verde

In research: Via Verde 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 Via Verde 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: Via Verde is common in secondary-school and first-year university syllabi. It links to neighbouring topics Electronic toll collection, Portuguese inventions, Road transport in Portugal, so understanding it makes those chapters shorter.
In everyday life: Look for Via Verde 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 Via Verde in 20 minutes

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

Frequently asked questions

What is Via Verde in simple terms?

Via Verde (literally "Green Lane") is an electronic toll collection system used in Portugal since April 1991. It is available at all toll roads and bridges in the country since 1995.

Why does Via Verde 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 Via Verde?

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 Via Verde.