How do double-decker buses not fall over?

By regulation British double decker busses must be stable when tilted to 28 degrees, London busses are tested to 35 degrees. The weight in the bus is low down. So the centre of gravity is low. So the centrifugal force required to tip it over is greater.



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By regulation British double decker busses must be stable when tilted to 28 degrees, London busses are tested to 35 degrees. The weight in the bus is low down. So the centre of gravity is low. So the centrifugal force required to tip it over is greater.

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Why is it that if we stand on one side of a double decker bus, it will be unstable and fall over? It won't. They are designed (and tested) to lean 28 degrees from the vertical with a fully laden top deck (and empty bottom deck) without falling over.

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Not only can passengers fall off after the vehicle collides into something, but they can get hit from the ensuing debris. Five years ago, a tour bus crashed into a traffic light pole and injured 14 people in the process. There are plenty of more ways passengers can receive injuries here compared to a regular bus.

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The driver turned frantically, and the bus tipped and went over the rail landing on its roof 25 feet below. In all, 29 people, 28 students and one adult, died, most of whom were crushed and died quickly.

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Disadvantages of Double Decker Buses Despite their many advantages, double deckers are not without their drawbacks. Although they have a higher passenger capacity, the stairs to the upper level can pose a safety hazard and make them less accessible to individuals with handicaps.

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The benefit of double deckers is that they're easier to navigate around curves. The disadvantage is that they're somewhat less stable in turns as they have a higher center of gravity.

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The reason behind their colour dates to the early 1900s, when the transport system was operated by different rival companies. London General Omnibus Company (or L.G.O.C.) owned most of the buses and in 1907 painted its entire fleet red to stand out from competitors.

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The largest of these businesses, The London General Omnibus Company (LGOC), sought to differentiate from their competition and painted their buses bright red. At the time, I doubt anyone could have predicted the historical significance of choosing that one colour.

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The difference between these two types of bus is that the double-decker has twice the number of decks, hence the addition of “double” to their description. That is to say, the single-decker bus, commonly called a “bus”, has but one deck, whereas the double-decker bus has a second deck, placed above the lower one.

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There are two main reasons double decker transit buses are almost non-existent here in the US: one, low overpasses are very common here, and two, until recently there were no double decker transit buses even available here in the US.

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Disadvantages of Public Transport
  • The commute by public transport can be slower than by personal vehicles. ...
  • As public transport vehicles don't stop at specific destinations, you must take care of your travel from the stand or station to reach your desired stop.
  • Privacy is a big issue in public transport.


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Lo told the Post that the middle area of the lower deck of a bus was relatively safe for passengers in a collision. “The area is closer to the centre of gravity of the vehicle, so passengers will absorb less vibration and impact force when the vehicle collides with something,” Lo explained.

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The Volvo 9900, Volvo Buses' premium coach, received two prestigious awards at the international Busworld show in Brussels. Facing tough competition from eight rivals, the Volvo 9900 was voted both safest and best coach all categories in the Busworld Awards 2019 competition.

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A double-decker bus or double-deck bus is a bus that has two storeys or decks. They are used for mass transport in the United Kingdom, the United States, Canada, New Zealand, Europe, Asia and also in cities such as Sydney; the best-known example is the red London bus, namely the AEC Routemaster.

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