For anyone who still doesn't understand just how little safety oversight we have over motor vehicles in the US, I present to you Exhibit A: the Variable Messaging Digital Billboard Box Truck.
@DrTCombs I guess I see a reasonable use case to drive to parking lots of big events where people are walking to a from their car and possibly tailgating, but not everyday use.
@DrTCombs Yeah, scrolling signs on highways definitely need banning.