I remember the closing of curtains, envelopes edged in black. If you saw a funeral I was taught to stand still and bow my head as I crossed myself & said a short prayer silently, dad would remove his hat, it was repect and sympathy for the family. I first saw car headlights switched on for vehicles in the cortege when I went to live in NZ. Its so sensible & indicates to other drivers that you're part of the group - other road users would wait until the whole group had passed by even if they had right of way, sometimes a traffic cop would override traffic lights so a group could travel in convoy, I have noticed it used in the uk too occasionally, makes such sense- especially if you're from out of town & following someone else.