I ride with a steady headlight, a blinky white light pointed slightly to the right (gets the attention of people pulling out into traffic from the right into your path) a red blinky taillight on the rear of my rack, and one more red blinky in my seat tube (visible from both the right and left - makes me more visible from both sides). Wear a reflective vest also, with panniers that have reflective piping, reflectors on pedals, wheels, and rear rack. Check the rear view mirror frequently. FWIW, I feel safer in traffic after dark. It is much easier to blend into the surroundings in daylight, in my opinion.