I live in a small town. I ride in combination of highways, rural dirt roads, town traffic. A big mix.
I almost always wear a generous amount of screaming yellow on my bike.

Several times now I have been in a coffee shop or bakery before or after my ride and some stranger will come up to me and say "I passed you on the road while i was driving, and I just wanted you to know how great it was that I could see you so clearly with that bright color from a whole half mile behind you- I wish all bike riders would wear that color!". this has happened about 4 times over the past 3 years. I know that screaming yellow works. I see it for myself when i'm driving my car too.
Reflective tape, blinkies and reflectors all can help and are really needed at night, but nothing beats screaming yellow shirt/vest/etc during the daytime.