As cities tend to become more and more populated, the problem of transport becomes more and more complicated. Endless traffic jams, with numerous cars pointlessly idling while unnecessarily burning excess amounts of fuel. Also, some drivers still think that it is good to "warm up the engine" before driving. That draws an important question - is it better to leave the diesel engine running? The short and simple answer is no; leaving the diesel engine running is not better. There is an old my...