He was angry that other vehicles on the road were not respecting the funeral procession in which he was taking part, so he decided to drive on the center line of the highway to slow down traffic.
Do other vehicles have to yield to the funeral procession? What about through a red light?
In most states, at intersections, drivers in a funeral procession have the right to proceed through red lights, as long as the lead vehicle started through the intersection while the light was green. All the cars must also have their headlights and flashers on, and a flag or sticker indicating they are part of the procession.
Even so, cars in the procession must yield to emergency vehicles. And of course, it's not your job to impose funeral procession civility, lest your shenanigans cause you to have to ride in the hearse at the head of it.