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Author Topic: Widest Freeway  (Read 20047 times)

travelinmiles

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Re: Widest Freeway
« Reply #25 on: January 29, 2009, 08:18:20 PM »

I would say I-10 Katy Freeway in Houston.  Its anywhere between 16-12 mainlanes/HOV and 6 frontage lanes. This is for about a 15 mile sustained distance and doesnt include auxilary lanes.
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un1

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Re: Widest Freeway
« Reply #26 on: January 29, 2009, 10:15:23 PM »

The 401 in Ontario (Peek width 22-25 lanes) is way to small for the amount of traffic.

500,000 % 22 = 27,727.27... cars per day on each lane of the freeway.
Ontario's standard say that there should be a lane for each 5,000 cars of traffic daily.

Just :offtopic: ramblings.
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Duke87

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Re: Widest Freeway
« Reply #27 on: January 30, 2009, 12:14:33 AM »

Duke, 75 and 85 in GA is a single stretch of 16 total lanes and they aren't seperated.
Looking at it on Google earth, I see 14, but not 16.

The 401 in Ontario (Peek width 22-25 lanes) is way to small for the amount of traffic.

500,000 % 22 = 27,727.27... cars per day on each lane of the freeway.
Ontario's standard say that there should be a lane for each 5,000 cars of traffic daily.
That's a pretty ridiculous standard, if you ask me. 5,000 per day means 17.28 seconds between cars passing a given point. If you allow even 5 seconds you've got more than enough space for people to maintain a safe following distance (17280 cars per day).
It sounds like Ontario's standard is written with the idea of providing Level of Service A everywhere... which is simply not realistic. By that standard, the 401 should be a 100 lane freeway. Even if you can find the space, where are you going to find the money to build that?

No, once you've gotten to the point where you've got a 22 lane highway, it's only realistic to attempt to solve traffic problems by taking cars off of it rather than widening it even further. Try cutting a couple lanes out of the middle and building a subway line along it, how about.
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Chris

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Re: Widest Freeway
« Reply #28 on: January 30, 2009, 02:32:34 AM »

Standard lane capacities are 2,200 to 2,500 per hour. Dutch traffic engineers were baffled the Coentunnel near Amsterdam got 3,000 vehicles per lane per hour, which would technically impossible.

To get to a daily capacity, multiply the 2,200 to 2,500 by 10 tot 12 (depending on how busy the area is) and you've got yourself the daily capacity for a lane.

So a six lane freeway would have an approximate capacity of 2,200 * 10 * 6 = 132,000 vehicles per day.

 


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