I know im technically stil a newb at riding, but i just dont trust drivers, dont think ill even do it at slow speeds...
a buddy of mine was doin the exact same thing around 45 mphin stopped traffic, and some jackass opens his door.
My buddy nailed the door, flies over and hits the next car (broken ribs, arm)
he got really messed up, sued the driver and won.
But still, it scares me a bit to do it...