I guess it's usually only an real issue for me when I'm on the Greenway which at night I am travelling upon toward the North. There's horrible glare from oncoming traffic on the other side of a barrier. The path is twisty and narrow at times, so under these circumstances it's very hard to see anything that's not very close. It's very easy to get confused by a red blinkie, believe me. Note that this is where 95% of my night riding takes place.
Anyway, I didn't expect this to be big deal, just wanted to know what others think.