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Old November 26th, 2009, 06:35 AM   #4981
HAWC1506
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This is only the beginning. Over the next 10 years, many bridges and structures are over 50 years in lifetime and have operated far over original design capacity during the last 4 decades. I've read the I-295 in NJ had a capacity of 40,000 at 4 lane sections and 75,000 at six-lane sections. If that count for other freeways too, there's a problem because there are many four-lane sections that carry in excess of 80,000 AADT and six-lane sections that carry over 130,000 AADT.
Well, that means two things.

1. We're going to be in deep financial gridlock with so much of our infrastructure to replace.

2. I'll probably have a job when I graduate from college! But first I have to get into college...
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Old November 26th, 2009, 05:42 PM   #4982
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Well, that means two things.

1. We're going to be in deep financial gridlock with so much of our infrastructure to replace.

2. I'll probably have a job when I graduate from college! But first I have to get into college...
Good luck dude. I graduated at the worst possible time and still nothing. Gotta made do though.
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Old November 26th, 2009, 07:10 PM   #4983
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Chris, you're a traffic... something, so you might be able to answer this question...

Is a 3+3+3+3+3+3 better than a 9+9 road??
And if so, why??
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Old November 26th, 2009, 07:38 PM   #4984
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If you have more than 4 adjacent lanes per direction, the capacity per lane decreases. It allows for too much turbulence between the lanes, reducing capacity.

Another problem is that a local/express setup requires more space, because there are more barriers, more shoulders and larger interchanges necessary.

However, I think local/express setup should have at least 5 lanes each way (3+2). Splitting up 4 lanes into 2+2 each way seems uneconomical to me.

A local/express setup is also useful in areas with a lot of offramps with limited capacity. That way, only the local lanes become jammed, while the express lane can continue to operate with free flowing traffic. If there was just one roadway with 5 or 6 lanes, all lanes would suffer from the limited off-ramp capacity, creating more congestion than necessary. In worse conditions, one single malfunctioning offramp could create a 10 mile backup, while if that would've been a local/express setup, the backup wouldn't be 10 miles x 5 lanes (=50 lane miles congestion), but 2 miles x 2 lanes (= 4 lane miles congestion). Overall, traffic would improve significantly, even if there are actually not more lanes. Same number of lanes, 12 times less congestion on a per lane mile basis.

Last edited by ChrisZwolle; November 26th, 2009 at 07:44 PM.
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Old November 27th, 2009, 10:36 AM   #4985
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Good luck dude. I graduated at the worst possible time and still nothing. Gotta made do though.
What was your major?
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Old November 28th, 2009, 09:28 AM   #4986
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What was your major?
Civil and Environmental Engineering at UC Berkeley.

And I don't mind the local express set ups, just sucks when the local dumps back onto the express. Haven't really seen much of it in CA except locally in San Diego at the big 5-805 merge they do a "Local Bypass" that bypasses the interchange to lead to 56 and also has one local exit. There was a lot of split arrangements in the Chicago area I remember. I dont know in CA it seems that there is an understanding that if you are not planning to exit any time soon, stay out of the 2 right lanes unless you're a truck or driving slower. Not the most efficient but the highways are old.
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Old November 28th, 2009, 11:59 AM   #4987
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Quote:
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There was a lot of split arrangements in the Chicago area I remember.
There are two basically.

* The Dan Ryan Expressway (I-90/I-94) south of downtown which has a true local/express setup.
* The John F. Kennedy Expressway (I-90/I-94) north of downtown which has a reversible 3rd carriageway in the median.
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Old November 28th, 2009, 04:24 PM   #4988
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I think the 405/5 merge north of LA is really cool. (cars and trucks merging separately)

Are there other examples of this outside of CA or outside of the US ?
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Old November 28th, 2009, 04:32 PM   #4989
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You mean truck lanes? They want to construct those at the I-710, the Long Beach Freeway from Long Beach to Alhambra. That freeway carries 40,000 trucks per day, which ship goods between the port of Los Angeles and the rail yards in the Inland Empire. (those rail yards should've been at the port itself, then you wouldn't need to be driving back and forth all the time with trucks for that short distance).

Last edited by ChrisZwolle; November 28th, 2009 at 04:51 PM.
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Old November 28th, 2009, 04:39 PM   #4990
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Quote:
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You mean truck lanes?
No. I mean separating cars and trucks before an interchange so that slower and faster traffic can merge separately.
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Old November 28th, 2009, 04:45 PM   #4991
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Sorry. I got confused. Turns out it's the I-5/ CA14 interchange I was talking about:

[IMG]http://i49.************/25ge803.jpg[/IMG]
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Old November 28th, 2009, 05:04 PM   #4992
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love highway I95 going from miami all the way to pensilvenia
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Old November 28th, 2009, 06:12 PM   #4993
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Quote:
Originally Posted by snowman159 View Post
Sorry. I got confused. Turns out it's the I-5/ CA14 interchange I was talking about:

[IMG]http://i49.************/25ge803.jpg[/IMG]
That would be a good idea whenever a major grade to ascend is involved since trucks are heavier and their brakes have more work to do, so maybe other western states might have it.
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Old November 29th, 2009, 12:54 AM   #4994
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Civil and Environmental Engineering at UC Berkeley.
Ahh I'll just have to cross my fingers. I'm thinking about doing structural engineering.

I think I might have posted this a few months (years?) ago. Here's a planned interchange between I-90 and I-405 in Seattle, with not only regular ramps, but also direct access HOV ramps from either highway. I personally think it's too big and that we should be focusing on other solutions instead of constant expansion. But here it is anyway:

Existing:



Master Plan:

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Old November 29th, 2009, 01:14 AM   #4995
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The downside of those HOV-lanes western USA loves so much is indeed huge interchanges.
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Old November 29th, 2009, 09:48 PM   #4996
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Quote:
Originally Posted by snowman159 View Post
I think the 405/5 merge north of LA is really cool. (cars and trucks merging separately)

Are there other examples of this outside of CA or outside of the US ?
German A7×A5, if coming from Kassel on A7.
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Old November 30th, 2009, 01:59 AM   #4997
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Quote:
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The downside of those HOV-lanes western USA loves so much is indeed huge interchanges.
This is a downside?
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Old November 30th, 2009, 04:48 AM   #4998
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Ahh I'll just have to cross my fingers. I'm thinking about doing structural engineering.
By the time youre out things will have turned around I'll bet.
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Old December 1st, 2009, 01:46 AM   #4999
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Sure hope so.

A cool overpass on SR520 in Washington.

http://www.redmond.gov/community/ove...tBridgeMap.pdf
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Old December 5th, 2009, 05:46 AM   #5000
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Sure hope so.

A cool overpass on SR520 in Washington.

http://www.redmond.gov/community/ove...tBridgeMap.pdf
very nice design indeed
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