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How now to use the snow chains

 

In order to cope with the snow that fell in Bratislava, the capital of Slovakia, a driver decided to mount  snow chains on his tires drive his car on a snow cover road.
To his surprise, even if he mounted the snow chains, the car still did not move. Why? Because he mounted the chains on the rear wheels and his car had front wheel drive.

Surely his old car was a BMW: