If you drive a lot more on the highway, idling never occurs, however in traffic, you have the tendency to idle a lot, which places immense warmth on the engine. The best point to do is to look at the timer on the traffic signal and shut off your automobile appropriately or keeping the vehicle in neutral and giving some extra Revoltions Per Minute to the automobile to ensure that idling doesn't happen much.
Yet today, you don't need to do that! The idling you do on today's vehicle burns priceless energy and leaves gas residue on the cyndrical tube walls that adhere to it since the cylinders typically aren't moving as fast as they normally do. This infects the engine oil with carbon deposit as well as makes your vehicle's innards dirty.