In Italy most people think that you must have your headlights on when on the Autostrada. In fact, except when you are in a tunnel, daytime running lights are required even on ordinary roads outside urban centres. In other words they are not required in town. It seems that the position (side)lights should be enough. Naturally in a tunnel or other conditions of poor visibility you must have headlights on. Three wheelers are treated as for motorcycles and must have headlights on at all times.
Italian built cars usually have headlights and position lights that are turned off when the ignition is off and many drivers in Italy, myself included, always drive with headlights on.
I think the position lights on some older cars may not really be bright enough so I would recommend headlights not only to comply with the law but for safety.