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Old February 16th, 2014, 10:29 AM   #2401
ChrisZwolle
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A two-lane road has no problem handling traffic in the 10 -15k range, the main issue would be capacity at traffic signals. For example the bridge at Hastings carried 30k before it was replaced by a four-lane span. Roads with 10,000 vehicles per day are often twinned if they carry a high truck share or substantial long-distance traffic (divided highways are safer) but twinning is often ommited if traffic volumes are only briefly above 10,000 vpd or if it is expensive to widen (in case of a bridge or tunnel).
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Old February 16th, 2014, 06:28 PM   #2402
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Quote:
Originally Posted by ChrisZwolle View Post
A two-lane road has no problem handling traffic in the 10 -15k range, the main issue would be capacity at traffic signals. For example the bridge at Hastings carried 30k before it was replaced by a four-lane span. Roads with 10,000 vehicles per day are often twinned if they carry a high truck share or substantial long-distance traffic (divided highways are safer) but twinning is often ommited if traffic volumes are only briefly above 10,000 vpd or if it is expensive to widen (in case of a bridge or tunnel).
The road has no problem but the drivers definitely have the problem

I think 10 000 vpd is usually a warrant for 4-lane freeway in areas here. I know in Alberta they will put a divided expressway at least for it, and here we'd put 2x2 freeway. That said it isn't always done, there's one horrible 2-lane farm road here with 50 000 vpd and lights, jammed at all times
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Old February 16th, 2014, 10:06 PM   #2403
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Columbia–Wrightsville Bridge, Pennsylvania

The old Lincoln Highway Bridge across the Susquehanna River in Pennsylvania. It opened in 1930.

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Old February 18th, 2014, 09:56 PM   #2404
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Gateway Express, Florida

A new toll road has been announced for Pinellas County, Florida. It will be a tolled connection between the Bayside Bridge, US 19 and I-275. I couldn't find a good project website, but it will apparently cost $ 330 million and construction is planned for 2017-2022.

News article with video: http://www.wtsp.com/news/local/artic...inellas-County

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Old February 20th, 2014, 05:18 PM   #2405
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No love for roundabouts in the U.S.? How about this in Brighton, MI.
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Old February 20th, 2014, 05:20 PM   #2406
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Yuck.
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Old February 20th, 2014, 07:02 PM   #2407
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Wow!!! Almost like in the Old Blighty


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Old February 20th, 2014, 09:13 PM   #2408
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Holy crap, so many possible collision points from drivers confused about whether to stay in the roundabout or turn! Why did the make this as a dumbell instead of an oval?
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Old February 21st, 2014, 04:57 AM   #2409
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Plus the massive narrowing at the overpass and there are no facilities whatsoever for peds/ bikes. What a poorly executed idea all the way around.
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Old February 21st, 2014, 09:32 PM   #2410
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I-820 / TX-121 North Tarrant Express, Texas

The 13.3-mile North Tarrant Express (NTE), a $2.5 billion highway reconstruction project, is scheduled to open by the end of 2014, at least six months ahead of schedule. NTE Mobility Partners, the project developer, made the announcement at today’s Northeast Tarrant Transportation Summit in Hurst.

The five-year project, which began in late 2010, has included the reconstruction of expanded frontage lanes and main lanes and the addition of TEXpress managed lanes, along IH 820 and SH 121/183 between IH 35W in Fort Worth and Industrial Boulevard in Euless. In addition to future business potential and the current economic impact—the project has 2,200 people working along the corridor—the NTE project will have a dramatic impact on mobility in the Northeast Tarrant County region.

The NTE project will nearly double the road capacity with the addition of four TEXpress lanes throughout the length of corridor. Drivers will have the option to travel along the newly rebuilt general highway lanes and frontage roads at no charge, or enter the TEXpress Lanes, which feature variable tolling with the objective of maintaining a minimum rate of speed of 50 mph.
Good news for the Forth Worth area
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Old February 25th, 2014, 02:16 AM   #2411
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Quote:
Originally Posted by ChrisZwolle View Post
No love for roundabouts in the U.S.? How about this in Brighton, MI.
Any idea how long this has been constructed ? There are quite a few here in Mississippi and people have a hard enough time going through those simple two lane points. I can not imagine going through this with majority of American driver's little knowledge of them. I will say, fantastic design .
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Old February 25th, 2014, 03:05 AM   #2412
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The US-23 roundabouts have been there for several years now. I think it was completed in 2005 or so.
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Old February 25th, 2014, 09:28 AM   #2413
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I have no problem with conventional roundabouts or dumbbells and want to see more of them.

But are roundabouts undergoing mitosis really considered a good design anywhere, in Europe on modern roads?

But that monstrosity...I feel like even the best driver would experience information overload while simultaneously watching for other cars, navigating the curve, and trying to know where the lane goes.
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Old February 25th, 2014, 04:40 PM   #2414
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For those who understand Dutch: http://www.standaard.be/cnt/dmf20140221_00991251

I didn't watch the video, did read the text:

Veel van de dubbele rotondes in ons land zullen verdwijnen omdat ze nutteloos en zelfs gevaarlijk zijn. Dubbele rotondes zijn ronde punten met twee of meer rijvakken Sommige van die rotondes waren aangelegd om files te op te lossen, maar vaak zorgen ze voor nog meer file omdat mensen alleen maar de buitenste rijstrook durven nemen uit schrik dat ze anders gaan botsen met vrachtwagens of bussen.

My rough translation: "Many of the double roundabouts in [Belgium] will disappear because they are unnecessary and even dangerous. Double roundabouts are roundabouts with two or more lanes. Some of the roundabouts were built to solve traffic jams but often the (cause?) more jams because people only drive in the outermost lane out of fear that otherwise they'd collide with trucks or buses."

Doesn't say what authority is going to eliminate them or cite any figures for its conclusions, though.
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Old February 25th, 2014, 04:45 PM   #2415
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The Belgian article refers to two-lane roundabouts. These are different from the one in the photo above, which employs the turbo roundabout principle, where people generally stay within the lane once they entered the roundabout.

Two-lane roundabouts are rubbish because the available capacity is poorly utilized and encourages unpredictable behavior (drivers in the right lane may turn right or go three-quarters around, conflicting with traffic that goes straight across).


Multilane undivided non-turbo roundabouts (scrabble-factor) are only useful if they are very large, traffic circle-size and possibly controlled by traffic signals.
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Old February 25th, 2014, 08:10 PM   #2416
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Quote:
Originally Posted by zaphod View Post
I have no problem with conventional roundabouts or dumbbells and want to see more of them.

But are roundabouts undergoing mitosis really considered a good design anywhere, in Europe on modern roads?

But that monstrosity...I feel like even the best driver would experience information overload while simultaneously watching for other cars, navigating the curve, and trying to know where the lane goes.
I feel it may look like a "monstrosity" in fact that it could appear much more complex seeing it from above as we can see all of the design. However, driving and observing the roundabout from ground level may be a different situation entirely with signage,etc. We will just have to try it out..

And to be honest, looking at the access roads this roundabout most likely does not get enough traffic even at peak times to cause an issue.
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Old February 25th, 2014, 09:57 PM   #2417
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Glenn Highway in Alaska.
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Old February 27th, 2014, 09:43 PM   #2418
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SH 9 Copperas Cove, Texas

SH9, Cove bypass to Gatesville opens

Central Texas’ newest strip of state highway opened Feb. 20 with a ribbon-cutting ceremony for State Highway 9.

The new 3.5-mile bypass runs around the east side of Copperas Cove, connecting U.S. Highway 190 and Farm-to-Market 116, which leads motorists to Gatesville heading north.
Full report: http://www.forthoodsentinel.com/story.php?id=12964

SH 9 is a super two bypass of Copperas Cove, just west of Fort Hood. SH 9 was one of the original State Highways from 1919, but was scrapped in 1971 after becoming multiplexed with US Highways for the entire length.

It's another example of how the number of a highway doesn't tell you anything about its importance. High numbers can be vital routes, while low numbers can be local routes, as is the case with SH 9, it is only 3 miles long.
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Old February 27th, 2014, 09:50 PM   #2419
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LA-1 elevated road, Louisiana

La. Highway 1 project moving forward

Preliminary plans to build the second and final elevated section of La. Highway 1 between Golden Meadow and Leeville is moving forward.

The $330 million project is now expected to be completed sometime around 2017.
http://www.katc.com/news/la-highway-...oving-forward/

This is an unknown long bridge project. I only found out about it a few months ago. The elevated road bypasses a vital segment of State Highway 1 that is slowly sinking into the swamps and will become permanently submerged, not only during storm surges.

The planned length of the elevated road is 18 miles, which would make it one of the longest bridges in the world, and this type of records are not unknown to the state of Louisiana.

The location of the elevated road in its current form: http://goo.gl/maps/HqxvY
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Old March 6th, 2014, 07:54 AM   #2420
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Quote:
Originally Posted by ChrisZwolle View Post
La. Highway 1 project moving forward

Preliminary plans to build the second and final elevated section of La. Highway 1 between Golden Meadow and Leeville is moving forward.

The $330 million project is now expected to be completed sometime around 2017.
http://www.katc.com/news/la-highway-...oving-forward/

This is an unknown long bridge project. I only found out about it a few months ago. The elevated road bypasses a vital segment of State Highway 1 that is slowly sinking into the swamps and will become permanently submerged, not only during storm surges.

The planned length of the elevated road is 18 miles, which would make it one of the longest bridges in the world, and this type of records are not unknown to the state of Louisiana.

The location of the elevated road in its current form: http://goo.gl/maps/HqxvY

Should be a fantastic opportunity to get some great photos . The construction of these elevated roads being built over swamps is amazing to see, much more than bridge construction in my opinion.

Anyway , nice find!
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