Why do some roundabouts have these markings?
 

There are a few roundabouts that have the inner lane marked with yellow lines in some areas seemingly to guide traffic out of the inner lane. Something like the attached picture. This doesn't make any sense to me. Anyone know the reasoning?

Good question?

So you don’t drive there and make a single lane at that point.

Which immediately forces two lanes into one and seems rather dangerous. My question was what is the reasoning behind this.

Oh no! Another round about thread.
:popcorn::popcorn::popcorn:

Here’s a couple hundred answers.

https://www.talkofthevillages.com/fo...ght=Round+bout

https://www.talkofthevillages.com/fo...ght=Roundabout

https://www.talkofthevillages.com/fo...rchid=21669717

No, if you look at the lane markers, the outside lane instructs you to go straight...

Outside lane should only be going straight.
Before you get to the roundabout, READ THE LARGE GREEN SIGN AND NOTE THE ARROWS!


https://www.districtgov.org/communit...t-02-08-12.pdf

The question is why do some roundabouts transition to a single lane for a left turn but not others?

I believe that it has to do with a one lane exit. Posting #2 has two pictures.
The left picture has the yellow markings at 12 o'clock and 6 o'clock. The exits right after that (at 3 o'clock and 9 o'clock) have a one lane exit. The picture on the right (without the yellow markings) has two lane exits at all four exit posts.

I think it forces traffic into the outer lane if you are planning on taking the one lane exits.

See the link to posting #7.

These are "A striped channelization island is present in several roundabouts, which reduces the circulatory roadway to
one lane approaching a single-lane exit."

Useless post: None of those links answered the specific question.

outside lane should only be going straight?
Which lane should I be in if I wish to turn and exit the roundabout?

I think the answer to the specific original question is that the orange lane marker squeezes the traffic into one lane because the road at that exit point is a one lane road.

Where they don't have the orange lane marker, you can exit from the left lane of the roundabout into the left lane of the road you are entering (e.g. Morse or Buena Vista).

However, for example, at the Morse-Bonita roundabout, Bonita has only one lane to accept traffic from the roundabout, hence the roundabout has only one lane at that exit point.

EDIT: the diagram doesn't display that, but the aerial photo posted in a subsequent post does illustrate it.

Outside lane: 90 degrees or straight
Inside lane: straight or 270 degrees.

perhaps they made the one lane configuration to eliminate the idiots that insist on going 270 degrees around in the outer lane----and that includes the president of the idiots club that previously posted that he always uses the outside lane to go 270 degrees because HE believes it is "safer". Like Judge Judy says, "you can't fix stupid".

The roundabouts without the hash marks indicate that the exit off the main thoroughfare is a two-lane exit. The ones with hash marks indicate the next exit is a single lane.