The only time I’ve ever really seen it happen is on cars that have auto stop/start, which essentially turn themselves off anyway.
Edit: Thanks for the answers everyone! I, in fact, did not know to begin with that it is called the tachometer and measured the revolutions of the engine and not the tires!
In: 5
Imternal combustion Engines are like a domino chain. If you stop it, it will not proceed until it is started again. Since older technology needed to be able to “go” at a moments notice (eg at a stop sign) manufacturers kept the cycle going. The minimum “un-stallable” number of rpms is known as an idle, with the ability to go faster almost instantly. Newer cars may have engines that turn off, if the saving of gas and greenhouse emissions is the priority, not performance (it never was in the past). Hybrid cars don’t have this problem as they use the ICB to charge batteries and can thus take off without an engine. In short, it’s older tech and will be phased out eventually.
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