snipped
I think the 'research' you've read is biased and mis-informed. DRLs do NOT produce glare. If you've spent some time driving on two lane highways you'd realize that many cars blend into the road and/or back ground at distances that are too close to safely pass the car in front of you and I'm not talking about mile-away stuff. Also, vehicle colour plays a roll in how easy it is to identify and judge how far away a vehicle coming towards you really is. Smog and other weather conditions help to cloak an approaching vehicle as well as roads flanked by trees that throw intermittent shadows across the road. And then there's driver awareness as well, especially when drivers are driving long distances and get a little highway hypnosis without realizing it.
DRLs are not the great bogeyman many make them out to be. I've seen just about every excuse not to have them from their affect on fuel mileage to the 'blinding' glare from them. Another favorite is how some cars have the lights closer together than others, so therefore you really can't tell how far away they are. Most of this is put forward by people who have never spent any great amount of time driving where DRLs are used and therefore have no true sense of the little bit of extra safety they can provide.