Geneva wants ban on old diesel cars

In the wake of last week's ruling by a German court that cities can ban diesel cars to fight air pollution, it has emerged that Geneva has drawn up a plan to tackle the problem including a possible temporary ban on diesel cars when pollution levels are critical.

The Geneva plan, which was drawn up in autumn last year, is modelled on France’s Crit'Air system under which cars are grouped into six categories and colours, depending on the year of their registration, their energy efficiency, and their emission quantity.

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How automatic gearboxes work

Most modern automatic gearboxes have a set of gearscalled a planetary or epicyclic gear train.
A planetary gear set consists of a central gear called the sun gear, an outer ring with internal gearteeth (also known as the annulus, or ring gear), and two or three gears known as planet gears that rotate between the sun and ring gears.
The drive train is coupled to a mechanism known as a torque converter, which acts as a fluid drive between the engine and transmission.

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