Pedestrian Crossing

Odd little dream. It was at the pedestrian crossing at the West end of Princess Street, Edinburgh.
Pedestrians who were intent on crossing the road were given a yellow reflecting jacket by a policeman. They were then directed across the road to be met by another policeman at the far side, who relieved them of the jacket.
The process continued with the next pedestrian etc.
Did fluorescent jackets actually fluoresce, or merely reflect?