Cars should also not change lanes in the roundabouts. And they should stay in one lane or the other. Also, too many people cross the line while driving in the roundabouts, nearly hitting cars next to them. This especially happens coming down Morse towards Sumter Landing when cars are in both lanes. And yes, you can go through either gate. One doesn't have to enter the resident gate....so there is no need to change from the left lane right before the gate. Here is a link I found on this site right after we moved here and it was quite helpful.
Much like the villages brochure on roundabouts:
http://www.wsdot.wa.gov/safety/roundabouts/
Video on driving roundabouts:
[ame]http://www.youtube.com/watch?v=MywmtskFiiI[/ame]