science

Le Bus Direct

Le Bus Direct 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 Le Bus Direct rather than just read about it. In short: Le Bus Direct (formerly Les Cars Air France) was a network of express bus routes operating between Paris and the two major airports in the region (Charles de Gaulle Airport and Orly Airport) and a bus route that connected the two airports. The service has its roots in similar bus routes that started in 1930.

Key takeaways

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

Reference excerpt

Le Bus Direct (formerly Les Cars Air France) was a network of express bus routes operating between Paris and the two major airports in the region (Charles de Gaulle Airport and Orly Airport) and a bus route that connected the two airports. The service has its roots in similar bus routes that started in 1930. The service was terminated on 1 April 2020 as a result of the drop in passengers due to the impact of the COVID-19 pandemic on aviation.

History The service traces its history to a service established by Lignes Aériennes Farman (English: Farman Air Lines) which offered travelers coaches between Paris and Paris–Le Bourget Airport. The service was continued by Farman's successor airlines, Société Générale des Transports Aériens (SGTA) and Air France, which renamed the service "Les Cars Air France" 'Air France Coaches'. At the beginning of the service, all passengers were checked-in for their flight at a terminal in Paris and shuttled out to the airfield in coaches. In 1946, the Aérogare des Invalides air terminal opened in Paris along with the Orly Airport. This continued until 1961, when check-in desks were centralized at the airport. After the 1960s, Air France retained its coach service from Paris to the airports and opened up the service to any passengers, even if they weren't flying Air France. On 12 May 2016, Keolis began running the service and it was renamed "Le Bus Direct", and connected with the Paris Aéroport brand. At that time, the Invalides terminal was abandoned in favor of other stops around the Paris area. The service was terminated on 1 April 2020 as a result of the drop in passengers due to the impact of the COVID-19 pandemic on aviation.

Routes Before the termination of the service, four routes were operated by Le Bus Direct:

Route 1: Orly Airport – Paris (Étoile) Routing: Orly Airport Terminal 4 – Orly Airport Terminals 1/2/3 – Gare Montparnasse – Trocadéro – Etoile/Champs-Elysées Travel Time: 20 to 60 minutes Frequency: every 20 minutes Hours of operation: 04:50 to 23:35

Route 2: CDG Airport – Paris (Eiffel Tower) Routing: CDG Airport Terminals 2E/2F – CDG Airport Terminals 2A/2C/2D – CDG Airport Terminal 1 – Porte Maillot/Palais des Congrès – Etoile/Champs-Elysées – Eiffel Tower Travel Time: 45 to 60 minutes Frequency: every 30 minutes Hours of operation: 05:30 to 23:30

Route 3 CDG Airport – Orly Airport Routing: Orly Airport Terminal 4 – Orly Airport Terminals 1/2/3 – CDG Airport Terminals 2A/2C/2D – CDG Airport Terminals 2E/2F Travel Time: 70 to 80 minutes Frequency: every 25 to 40 minutes Hours of operation: 06:10 to 21:50

Route 4 CDG Airport – Paris (Gare Montparnasse) Routing: CDG Airport Terminals 2E/2F – CDG Airport Terminals 2A/2C/2D – CDG Airport Terminal 1 – Gare de Lyon – Gare Montparnasse Travel Time: 40 to 80 minutes Frequency: every 30 minutes Hours of operation: 05:45 to 20:45

References

External links

Official Site Archived 2020-04-17 at the Wayback Machine

Illustrations

Worked examples

Example 1 — a first encounter with Le Bus Direct

Start with the simplest possible case. Write down what Le Bus Direct 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 Le Bus Direct 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 Le Bus Direct 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 Le Bus Direct

In research: Le Bus Direct 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 Le Bus Direct 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: Le Bus Direct is common in secondary-school and first-year university syllabi. It links to neighbouring topics Airport bus services, Charles de Gaulle Airport, People mover systems in France, so understanding it makes those chapters shorter.
In everyday life: Look for Le Bus Direct 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 Le Bus Direct in 20 minutes

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

Frequently asked questions

What is Le Bus Direct in simple terms?

Why does Le Bus Direct 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 Le Bus Direct?

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 Le Bus Direct.