I agree. Twilight is the worst. Really dark is the most peaceful time to ride. My experience with lights on my bike gives me the idea that it's easier to see me in the complete darkness than at twilight.
Maybe it does have something to do with the distracted drivers at rush hour, so I can't rule that out either.
So, I got one of those class II reflective vests. It gives me peace of mind to know that I'm doing what I can to be seen.
Given my position on helmets, it may be that I'm just some sort of paranoid safety freak. I just don't want to get hit. It looks like it hurts.
My next "safety measure" is to only ride the bike under "ideal" conditions.
Then, the next step is to give up riding the bike completely.
Then I'll drive a car.
Then I'll buy a big, fat SUV. I'll put all kinds of reflective hi-vis stuff all over it. I'll wear a helmet while I drive it. I'll be really "safe." Hope I don't drive into a bike commuter while I'm talking on my cell phone, lighting my cigarette, spilling my coffee and trying to beat the mob of other cars to the next stoplight at TWILIGHT.