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Old December 30th, 2008, 08:04 PM   #21
Rebasepoiss
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If you follow the traffic lights, it's not more dangerous than an average intersection.
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Old December 30th, 2008, 08:06 PM   #22
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It's not very common in some places, which might lead to confusion, hence possibly dangerous situations. Road layouts should be standardized as much as possible at all times. People expect situations to be similar.
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Old December 30th, 2008, 08:18 PM   #23
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How about this?



This sign is somewhere around the highest tree in the foreground:
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Old December 30th, 2008, 08:22 PM   #24
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This would be better and simpler;


( and then turn left again)
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Old December 30th, 2008, 08:55 PM   #25
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Quote:
Originally Posted by ChrisZwolle View Post
This would be better and simpler;


( and then turn left again)
we have a lot of these. unfortunately, people are often stupid and don't understand the purpose of that sign, and are forcing to turn direct left.
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Old December 30th, 2008, 09:57 PM   #26
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Quote:
Originally Posted by Dan1113 View Post
Found it! Here are the new ones they've put in Salt Lake City:



What do you all think?
i'm not sure, but this was invented in mexico....
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Old December 30th, 2008, 10:10 PM   #27
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an example of 'vuelta inglesa' (english turn)





2,3,9,10 stright
1,4,5,6 left turns
7,8,11,12 to change of line
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Last edited by &reX; December 30th, 2008 at 10:39 PM.
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Old December 30th, 2008, 10:12 PM   #28
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what is actually the purpose od this? additional trafficlights and slowing down the traffic?
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Old December 30th, 2008, 10:29 PM   #29
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Remember the left turn is the most problematic on many intersections, especially if two flows cross eachother at that left turn.
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Old December 30th, 2008, 10:40 PM   #30
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Quote:
Originally Posted by x-type View Post
what is actually the purpose od this? additional trafficlights and slowing down the traffic?
no, it´s faster than simple left turns (like 5 and 6)

look image up

1,2,3,4,11,12 go at same time
9,10,7,8 after
5,6 at end.
and all again...

(i edited the order)
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Last edited by &reX; December 30th, 2008 at 11:58 PM.
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Old December 30th, 2008, 10:54 PM   #31
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Quote:
Originally Posted by &reX View Post
no, it´s faster than simple left turns (like 5 and 6)

look image up

1,2,3,4 go at same time
5,6,7,8 after
9,10,11,12 at end.
and all again...
ok, but anyway 1234 have additional traffic lights at 7 and 8. green wave can solve only half of those if it exists, other half still waits at another traffic lights.
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Old December 30th, 2008, 11:46 PM   #32
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ok sorry, may be I didn't explain you correctly.

when you are on 7 or 8 and get green, you go to 1 or 4 (50 meters), when you arrive to 1 or 4 it change to green (you don´t wait more time) and 7 and 8 change to red, because if you are on 2 or 3 and get green, 11 and 12 change green too (you don´t wait more time).

9 and 10 haven´t any problem they change to green after 1,2,3,4.

you only wait more time if get green on 5 or 6 (simple left turn) because when you arrive to 11 or 12, they are on red (and you have to wait 7 or 8 change to red, and 1,2,3,4,11,12 are green at same time) :lol

i hope don´t get you confuse xD
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Last edited by &reX; December 31st, 2008 at 12:00 AM.
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Old December 31st, 2008, 02:12 AM   #33
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I'll be in SLC this June, will have to try it to see how it works! It doesn't seem like it would save any extra time but it'll be neat to see.
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Old December 31st, 2008, 08:42 AM   #34
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Continuous flow intersection

Quote:
Originally Posted by Dan1113 View Post
Found it! Here are the new ones they've put in Salt Lake City:



What do you all think?
I think the continuous flow intersection is one of the most brilliant innovations in intersection design ever (although the name is misleading, traffic definitely doesn't flow continuously). If used on all four legs, it can effectively double the capacity of the intersection without using grade separations. At an intersection of two high-volume urban arterials, where it would most likely be used, only two signal cycles are needed instead of the typical four (north-south left turns, north-south through, east-west left turns, east-west through), so there could be double the number of cars traveling through the intersection at any one time. It's also logical for drivers (unlike a New Jersey jughandle) because all turns are made from the expected lanes (left from left, right from right) just like a normal intersection. The only drawbacks I see are that the right-of-way may need to be a little wider, and access to any businesses located on the corners is more difficult.

The Utah Dept. of Transportation has a website that explains the "CFI."

http://www.dot.utah.gov/main/f?p=100...4:::1:T,V:2008,

It also has an excellent animation that shows how it works better than I could ever describe in words:

http://www.udot.utah.gov/i/udot/ucon/cfi_anim.swf

Since this is my first post here, I would like to thank Chris for this wonderful forum, as well as all the posters who make it so interesting. Thanks!!
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Old December 31st, 2008, 01:13 PM   #35
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wow, this is a really cool animation! Thanks for posting! I was extremely amazed. Well, it might be a bit oversized for European suburban intersections and the waiting times for pedestrians to cross the street when left turners AND drivers going straight have green signals should be quite long but anyway, an interesting and creative way of handling high vehicle volumes at at-grade intersections.

Cool work!

Anyhow, the European versions with the left turners on the right forming a "quasi-semi-roundabout" (very frequently used in Spain and France) seem to be a bit more appropriate for more urban intersections regarding urban design issues/ qualities.
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Old December 31st, 2008, 05:33 PM   #36
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The only main problem I can see happening is if more cars want to get into that left turn part on the left, and so they end up blocking half the road.
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Old December 31st, 2008, 06:55 PM   #37
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Quote:
Originally Posted by x-type View Post
why are you all talking about this as dangerous? it is absolutely not more dangerous than ordinary intersection with traffic lights.
Imagine the traffic lights being out of duty...
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Old January 1st, 2009, 06:42 AM   #38
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Quote:
Originally Posted by Svartmetall View Post
These are everywhere in Melbourne due to trams. They're called "hook turns".
Not quite correct. Hook turns are right turns from left lanes, not left turns from right lanes.

They are all found in the CBD (or downtown Melbourne), except for some unpopular ones in South Melbourne.

Australia has a few similar intersections, not relating to trams:

Elwood, Melbourne (left turn from right lane) : http://maps.google.com.au/maps?ie=UT...01717&t=k&z=19

Gold Coast Hwy on Main Beach (right turn from left lane). http://maps.google.com.au/maps?ie=UT...01717&t=k&z=19

Mark.
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Old January 2nd, 2009, 04:37 AM   #39
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Hook turn

Quote:
Originally Posted by Svartmetall View Post
These are everywhere in Melbourne due to trams. They're called "hook turns".
Here's a photo of 2 cars in Melbourne waiting on the left side of the intersection to turn right over the tram tracks. You can (barely) see the "right turn from left only" sign overhead.

image hosted on flickr


Better picture of the hook turn sign.

image hosted on flickr

Last edited by Natomasken; January 3rd, 2009 at 11:31 PM. Reason: image links didn't work
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Old January 2nd, 2009, 06:30 AM   #40
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Quote:
Originally Posted by Dan1113 View Post
Found it! Here are the new ones they've put in Salt Lake City:



What do you all think?

Yeah, this kind of interseccions are common in many cities around Mexico.
This is an exemple in Tijuana.



Closer look
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