The basic rule for riding a road bike is: pretend you are a pro cyclist and do what the pros do.
So, even if you ride at night, it is FORBIDDEN to have reflectors or lights on your bike on a road bike.
If you need to ride at night, your are required to ride a bike that in no way resembles a road bike. A Dutch commuting bike is acceptable.
Anytime you have a question about a bike, bike equipment, or clothing, just ask "What would Lance do?
Also, you need to be considerate of drivers. A few nights ago, I was in a car around midnight. Pouring rain. Could barely see the front of the car. And, then, I was distracted by two bright yellow circles spinning around in front of us. It looked like we were driving into a circus. Had to slow down to figure out what it was. Turns out it was the reflectors on the pedals of a bike that was directly in front of us.
It was VERY rude and distracting for this guy to be flashing his pedal reflectors directly into our eyes. Have some consideration for motorists, please. Try to be invisible on the road.