For all the arguments for or against DRL's, there is one overiding
grievance I personally have.  Until driving public here in the States
learns to really drive - not talk on phone, not put on make-up, not be
distracted by the
Sonic-Boom-Base-Reflex-Speakers-Creating-The-Loudest-Most-Annoying-Noise-In
-The-Known-Universe, not trying to eat a bowl of cereal, etc., etc. - then
and only then will your DRL's make you more noticeable.  If the we continue
to pull out in front of the other guy because we're in a hurry or continue
to display the kind of aggressive behavior that prompts the all too common
malady of "Road Rage", DRL's won't help you worth a damn.
The DRL's on my wife's Crapsler Mini Thingy does not stop the
right-turn-on-red artists from pulling out in front of us.  And they didn't
stop the guy in his Saturn, on the cell phone taking sales notes, from
changing lanes into the side of said Crapsler.

Disclaimer:  The above does not apply to Vanagons, in any of their
configurations, as Vanagon owners do not pull out in front of others
because they love the vans, want to keep them in good condiction, and know
they lack the acceleration anyway.

My $.02 worth of idle ranting.

Alan Bosch, aka Ever the Wannabus
"...fah'n, fah'n, fah'n, auf der Autobahn..."