Definitely depends on the how.
At high speeds is for sure a bad decision. Of course it depends on the car, there can be some differences. Some dont even start when not stopped.
With manual transmission disengaged or automatic in neutral the car while just roll on. But support for breaks and steering will stop. Without disengaging the engine will slow the car down. For starting you need to disengage.
A diesel engine however can be started by dropping the clutch while rolling without ignition turned on.
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