Alas, we will never get everyone on the same page, even though there is a illustrated document that explains how to negotiate a roundabout.
http://www.districtgov.org/community...t-02-08-12.pdf
In a nutshell, if you are going to take the first or second exit it is best to enter the roundabout in the right lane; if you are going to take the third or forth (u turn) exit it is best to enter the roundabout in the left lane.
However, even then there is the hazard of conflict at every exit from cars who entered from other approaches and are in different lanes with different destinations.
And even if we got everyone to read the brochure there would be those who either didn't understand it, didn't agree with it......or both.
Drive defensively.