found this on google Purple Lights Purple Lights, although rarely seen, are affixed to hearses or funeral vehicles to warn others of a procession. These are by no means emergency vehicles, and you're in no way mandated to move out of the way for these vehicles. Purple Light Conclusion: Non-emergency, used on hearses for funeral processions. You're not mandated to move over. .Source: "New York State Vehicle and Traffic Law". 2007-2008 Edition.