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The best start-stop automotive system is a small hybrid system that does nothing more than roll the vehicle the first five to ten feet from a stop. Of course the internal-combustion-engine starts up during that roll. But current hybrid systems are larger, heavier, and more expensive than just a system for beginning a roll from a stop. Now the best hybrid ...


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The simple answer is because any feature costs money, so car makers won't include it unless they're forced to. On some models it's available as an option for extra cost - which relies on the purchaser wanting it. On others, where there's no option, it hasn't been designed for that model, so there's design cost as well as per-unit cost to consider. As this ...


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Idling is particularly bad for NO2 emissions, which are a major concern for air quality. Here's an old paper showing that an idling engine emits more NO2 than one driving at 40 km/h, despite emitting less NO; NO2 is much worse for human health. More recent studies that I've found don't change the conclusion. At a junction near me there's currently an ...


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Cars idling use about 1 litre per hour of petrol (link). Imagine 30 cars sitting together waiting in a traffic jam with their engines running for just one minute; they would burn 0.5L of petrol and create the associated pollution. Here is a video of a 0.5L bottle of petrol being burnt. The difference here between using stop-start and no stop-start would ...


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A car stationary but left running (idling) will cause pollution in that specific location; start stop technology could avoid the pollution responsible for idling. Here I will concentrate not on the global impact of the pollution but at the localised affected area. The differing scenarios are important to understand how much of an effect start-stop will ...


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This is going to be unpopular, because I can remember things that mankind has forgotten. A long time ago people were saying that the shading from contrails might cause another ice age. Now the word contrails has been almost forgotten and a recent weather program was calling them something else entirely and intimating that they are natural. Contrails cause ...


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