Quote:
Originally Posted by ColdNoMore
...and a big contributor to the confusion by some people (I know, I know...no one will actually admit to it  ) is the lack of consistency in signage AND striping. 
Note the following photos (numbered from left to right).
1. 2 lanes entering from all 4 sides, 2 lanes all the way around the roundabout...but sign only shows one lane.
2. Same as sign in #1, but it actually narrows to 1 lane within the roundabout...but only for part of it.
3 & 4. Showing roundabout in photo #2.
5. Sign accurately showing two lanes around entire roundabout. |
Guide signs are not meant to provide number of lane detail, just direction. Your last photo does not show two lanes going around the circular island, it shows two lanes going to the right of the island and only one lane going left. The photo showing the single lane moving from the inside to the outside is called spiral marking. Since only the left lane can go left around the circle, they chose to move it to the outside lane to clarify that traffic entering needs to yield as that lane comes around. this is done when the cross street only has one lane around the circle.
The black and white lane use signs (if any) are the regulatory signs that describe which lane can go which way.