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Encyclopedia > Rollover
A rollover in Sydney, Australia on Christmas day, 2001.

Rollover is a type of vehicle accident, where a vehicle turns over on its side or roof. This happens when the centre of mass ends up outside of the vehicle area of contact with the ground defined by its wheels. A car accident in Sydney, Australia on Christmas day, 2001. ... A car accident in Sydney, Australia on Christmas day, 2001. ... Sydney is the capital city of the Australian state of New South Wales and Australias largest and oldest city (founded in 1788). ... 2001: A Space Odyssey. ... A car accident in Yate, near Bristol, England, in July 2004. ... The center of mass or center of inertia of an object is a point at which the objects mass can be assumed, for many purposes, to be concentrated. ...

The main cause for rolling over is turning too sharply while moving too fast. The force of inertia (acting in the direction opposite to the one it is turning) is combined with the force of gravity (acting downwards). When the combined force as applied to the centre of vehicle's mass falls outside of the rectangle formed by the wheels, the vehicle starts to turn over. A skilled driver may stop the fall by stopping the turn. It is possible to drive the car then on two wheels for some time.

All cars are susceptible to rollovers to various extents. Generally, the higher the centre of mass is located, the higher the vehicle is and the faster it goes, the more likely it is to roll over. SUVs are particularly notorious for rolling over. Hummer jeeps, on the other hand, are nearly invulnerable to this type of accident. According to anecdotal evidence, however, it can be rolled in very specific circumstances and this was done on purpose twice in Israeli army. A driver needs to move backwards very fast and then do a sharp turn, and immediately slam the brakes to block the wheels. A sport utility vehicle (SUV) or off-roader is a vehicle that combines the load-hauling and passenger-carrying capacity of a large station wagon or minivan with features designed for off-road driving. ... This article is about the Hummer vehicle. ... The Israel Defense Forces (IDF) (Hebrew: צבא ההגנה לישראל Tsva Ha-Haganah Le-Yisrael ([Army] Force [for] the Defense of Israel), often abbreviated צהל Tsahal, alternative English spelling Tzahal, is the name of Israels armed forces (army, air force and navy). ... A brake is a device for slowing or stopping the motion of a machine, and to keep it from starting to move. ... A driving wheel on a steam locomotive. ...

Trucks can often roll over when doing sharp turns and trains can roll over after derailing.

Some four wheel drive pickup trucks have reduced steering capacity to prevent rollover. This creates problems with parking and negotiating very sharp curves. Four wheel drive or 4x4, is a type of four wheeled vehicle drivetrain configuration that enables all four wheels to receive power from the engine simultaneously in order to provide maximum traction. ... Mazda compact Pickup truck with extended cabin and homebuilt lumber rack. ...

A vehicle may roll over for other reasons, for example when hitting a large obstacle with one of its wheels, when manoeuvring over uneven terrain, etc.

After the rollover the vehicle may end up lying on the side or on the roof, often blocking the doors and complicating the escape for the passengers. Large passenger vehicles such as buses, trams and trolleybuses that have doors on one side only usually have special windows with handles to pull to use the window as an emergency exit or glaziers fixed near the windows for cutting the glass and making an improvised exit in case of a rollover. Some have emergency exits in their roofs. A modern tram in the TÃ¶Ã¶lÃ¶ district of Helsinki, Finland Volkswagen Cargo-Tram in Dresden. ... An articulated trolleybus in Arnhem A trolleybus (also known as electric bus, trolley bus, trolley coach, trackless trolley, trackless tram or simply trolley) is a bus powered by two overhead electric wires, from which the bus draws electricity using two trolley poles. ... Glazier is a profession in which the person cuts flat glass to size as well as carpentery tasks. ...

Results from FactBites:

 Advocates for Highway and Auto Safety (825 words) Rollovers are among the most dangerous types of vehicle crashes because of the high incidence of occupant ejection and head injuries. In 2002, 8,768 of the 10,666 occupant deaths from rollover crashes occurred in single-vehicle rollover crashes. Rollover crashes are the leading cause of fatalities in SUVs, whereas frontal collisions are the leading cause of death for passenger cars.
 Safercar.gov - Rollover (1857 words) In fact, certain five-star vehicles, such as sports cars, may have a higher number of rollovers per 100 registered vehicles than certain three-star vehicles, such as minivans, due to the aggressive way in which the vehicle is driven and/or the age and skill of the driver. The Static Stability Factor (SSF) is specifically designed to measure this more common type of rollover and thus plays a significantly larger role in a vehicle's star rating (for model years 2004 and later) than the results of the dynamic maneuvering test. The tip-up/no tip-up results are then used with the SSF measurement as inputs in a statistical model that estimates the vehicle's overall risk of rollover in a single-vehicle crash.
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