Diverging diamonds work pretty well. We have several off of I-40 here. I've ridden my bicycle thru one numerous times. Full clover leafs don't work well when traffic builds. As to bikes and round-abouts, I haven't had a problem negotiating my way around one. They aren't a one-size-fits-all solution, but used in the right places I'd much rather have a round-about than a traffic light or a 4 way stop.