I like roadway reflectors. The square ones with the ramp shape usually in the center line of the road. I also like the marker type, and the reflectors you sometimes see at "T" intersections that are a yellow diamond shape sign with the little round orange reflectors. I also used to like the round red reflectors on sticks people put on their driveways.

I do
I have purchased a few of them from a local water/industrial plumbing supply house in the past. They sell the blue two sided Rayolite raised pavement markers that have a adhesive pad stuck to the back. I stuck them on the road a couple times in front of our house because the one the city installed to mark the fire hydrant location had came off.

Cool. I think there some of those blue ones on my street near the shutoff for the water lines.

The main road off my street was repaved and widened and they painted angled lines on the side of the road and put lots of red reflectors which I can't figure out the purpose of.

One of the neighbor's house has two of the ramp reflectors on their driveway entrance with a screw holding them on. I used to have one of the ramp ones that came off the road that I kept, but it's probably gone by now.

I have a whole crate of them! I started to collect those before lighting. Lighting is my main hobby now but I still pick up reflectors every now and then.