I switch off the headlamps; but parking lights on. About switching off the engine, I don't do it as AC won't be effective if the engine is turned off. Also, another concern at the signals are that the vehicles keep moving slowly, finding their way inch by inch. If I switch off the engine to a halt, then the drivers from behind start yelling at those who are in front of (that would be me, of course!) them. So, I let the engine idle.