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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Rear vs Mid vs Front Engines – Which Is best?

Which configuration is the best: front, mid or rear engines? As usual, things aren’t so clear-cut. Each configuration has characteristics that make it good for some applications, but bad for others, so let’s break it all down.

Rear-Engines

Unless you’re on the racetrack, rear engine vehicles are kind of hard to come by. Reason being, these engine applications have a higher learning curve than other configurations.

But for race cars under the control of a professional driver, rear engines are great. They provide a lot of power and traction to the back wheels, which makes them quick to accelerate. Although, that same power to the back wheels can come back to bite them.

They are prone to oversteer – since the power and weight in the back wants to swing around to the front – but with the right suspension and chassis tuning, rear engine vehicles can be incredible sports cars. Just take a look at the Porsche 911.

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