&gt; <i>I wonder if anyone here knows what purple lights are reserved for? A purple light on a car is thing all drivers are meant to know.</i><p>Apparently for anything, from funeral service to escorting oversized vehicles to HAZMAT response to whatever you feel like - depending on which country you live in :).<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Emergency_vehicle_lighting" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Emergency_vehicle_lighting</a>