All right, you noticed the lamp designed to throw some light on the curb. That's the second point.
The first one is not to trip anything, but addresses a much more common issue.
@Paul Jaray: sorry Paul, I know, but I had to decide: you described only what it was (although Allemano's slot was equally correct) , but metalshapes came up with the "what for", to see the curb, and that is the question. He has to refine his answer though.