I always use lights when dark. What I'd like to know is, if I use lights, is it ok if I don't have a tail reflector? The reason I needed to clarify about this is, I don't have tail reflector (removed by the LBS when they installed the rear rack for me; they forgot to put it back.). I also hardly have room for it: on the seatpost it would be invisible and useless. Rack, seat stays, I use for my lights. But this law keeps bothering me. What kind of a cop would ticket someone who has the taillight on during the dark but is without a tail reflector?
On another note of the (un)usefulness of reflectors: since they are so directional, why don't they make it ball-shaped, so it will reflect in every direction?