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1. A large wheeled vehicle, intended to carry numerous persons in addition to the driver. The name is a shortened version of omnibus. Buses are essentially an upscaling of the idea of the automobile.

Many variations of buses exist. A normal tourist bus carries about fifty passangers and their luggage, and may be considered the standard bus for long-distance travel.

In buses meant for public transport, luggage space is often sacrificed in order to increase passanger volume, although the exterior is only slightly smaller than that of a tourist bus. Public transportation buses may carry more than one hundred persons if standing passangers are allowed.

The double decker is a bus designed in two stories. The purpose being to haul more passengers. Originally employed as a part of the London public transport system, in a distinctive red colour, they now see use all over the world.

Special sight seeing buses are variations of the tourist bus or the double decker and are generally constructed with large windows and/or an open top deck offering the best possible vantage point from inside a vehicle.

Jointed buses are yet another permutation for increasing passenger load. Almost singularly found in public transportation use, these buses are so long that they would not ordinarily fit in city traffic. To make them nimble enough, they have been fitted with an extra pair of wheels and a flexible joint (usually located slightly behind the midpoint of the bus, behind the second wheel pair).

Some rare combinations between double decker and jointed buses exist, but are not in common use.

Minibuses are smaller than the ordinary tourist or public transport bus, intended to carry from (about) eight to twenty passangers. Due to smaller size they are often used on routes with few passengers or on lines where the density of departures is very high.

As part of public transport, the scheules of buses often cannot be as well maintained as those of other public transport systems, due to the fact that buses share the same roads as common traffic. Some cities have tried to counter this by instituting special "bus lanes", where only public transport buses may travel.

The plural of bus is "buses" or "busses".

Some manufacturers of buses or bus parts:

2. A term in computing and electronics. It describes an electrical interface where many devices share the same electric connection allowing signals to be transferred between them (allowing information or power to be shared). See Computer bus.