Two-lane roundabout: who has right of way?

Started by NE2, April 11, 2013, 03:56:21 PM

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realjd

Quote from: agentsteel53 on April 12, 2013, 09:40:11 AM
aren't most of your roundabouts striped that way?  (well, flipped 180 degrees due to drive-on-left instead of drive-on-right)

In my experience, most of the roundabouts in the UK are unstriped.


english si

Quote from: realjd on April 13, 2013, 06:51:06 AM
Quote from: agentsteel53 on April 12, 2013, 09:40:11 AM
aren't most of your roundabouts striped that way?  (well, flipped 180 degrees due to drive-on-left instead of drive-on-right)
In my experience, most of the roundabouts in the UK are unstriped.
Though we typically work on a principle of implied common sense, so we don't need to be so prescriptive in our descriptive road markings... Also there's typically little room to mark lanes for the short distances involved!

Here's two lanes without marking it. Also note that right-hand lane on the joining road has yielded to Mr Streetview, but the left-hand lane hasn't. This is because it's quite clear we aren't going off to where the old wall is - road position (and you'd be indicating left to turn off) says Mr Streetview is going to continue around the roundabout to at least the next exit. Also note that no one is stupid enough to turn right from the left lane, even though there's no markings saying they shouldn't - and it's not just because it is busy!

kphoger

Whether there are signs saying so or not, this only shows why it is not a good idea to use the right lane when you intend to turn left.  Properly striped roundabouts can eliminate this issue.  To use agentsteel53's illustration more clearly, I've redrawn the red and blue lines to match the OP.

Quote from: agentsteel53 on April 11, 2013, 05:47:30 PM



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Alps

Quote from: realjd on April 13, 2013, 06:51:06 AM
Quote from: agentsteel53 on April 12, 2013, 09:40:11 AM
aren't most of your roundabouts striped that way?  (well, flipped 180 degrees due to drive-on-left instead of drive-on-right)

In my experience, most of the roundabouts in the UK are unstriped.
MUTCD presents multi-lane roundabout markings as an option, not Guidance (recommended) or Standard.

roadfro

The 2009 MUTCD has an entire chapter (Chapter 3C) on roundabout markings, with 14 examples of possible lane marking treatments. Several are of the "turbine" type that gradually direct a driver from the inner to the outer lane.

Taking a look at some of those examples might be instructive in answering some of the questions brought up in this thread. The important takeaway is that the markings (and signs) should clearly indicate what lanes are appropriate for each possible turning movement, such that issues of a left turning vehicle in an outer lane should not cause conflicts if the roundabout is adequately marked. The image in the OP and some others aren't adequately marked, thus causing the ambiguity.

Quote from: Steve on April 13, 2013, 03:00:35 PM
MUTCD presents multi-lane roundabout markings as an option, not Guidance (recommended) or Standard.

Actually, the current MUTCD has a guidance statement (3C.02, p3) that says multi-lane roundabouts should have lane markings in the circulating roadway to guide drivers to the appropriate exit lane.
Roadfro - AARoads Pacific Southwest moderator since 2010, Nevada roadgeek since 1983.

Alps

Quote from: roadfro on April 13, 2013, 05:56:29 PM

Quote from: Steve on April 13, 2013, 03:00:35 PM
MUTCD presents multi-lane roundabout markings as an option, not Guidance (recommended) or Standard.

Actually, the current MUTCD has a guidance statement (3C.02, p3) that says multi-lane roundabouts should have lane markings in the circulating roadway to guide drivers to the appropriate exit lane.
*hasn't worked on roundabout striping since pre-2009, sorry*



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