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
When the car is stopped the engine still runs at idle. Each engine has a specific idle range, lower and the car will stop, higher and you burn too much gas. The RPM gauge is measuring how fast the crankshaft spins in revolutions per minute. 700 is near or about idle, 7000 is maximum, again, dependent on the specific engine.
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