I always filter to the front. Last week filtering almost got me in trouble when a car tried to pass a left-turning vehicle by using the bike lane. I posted that story last week: Nearly got hozed in the bike lane...
Today I was reminded why I don't line up between the bumpers of drunks and texters. My "flight recorder" barely caught the sight and sounds of knuckleheadery. Turn up your volume to the max to hear the *CRUNCH* of plastic against steel. You can also see the wheels of the white SUV roll forward a bit at impact.
I'm gonna take my chances filtering. At least I only have a chance of being knocked down instead of crushed when I am NEXT to the cars.