I'm a real fan of the orange triangle, and I have one on my rear rack bag because I think it's prudent. I want the guy who kills me to be very guilty about it.
This Sunday at the Tour de Sewickley I saw a couple, probably in their 50's, in the photo below. I asked if I could take their picture and they posed nicely but facing me, and then I explained that I wanted the view of the triangles. They were very good sports.