At just a stop light, no: stopping and restarting a car takes more gas (and is harder on the engine) than just allowing a vehicle to idle. If the idle is going to take longer than 30 seconds, then it is more efficient to turn off the motor.
I don’t know. I am really bad about idling my car. In the winter time, I let my car idle until all of the snow is melted off of the windshield.
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