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11 Foot 8 – The Can-opener Bridge

11foot8.com

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Re: 11 Foot 8 – The Can-opener Bridge

#101

Post by userbinator »

syshum wrote: post #86
johan_larson wrote: post #70

How about something counter-intuitive: lower the limit? There is a built-in hard limit imposed by the structure itself. Set the marked limit to something well short of that, like 8 feet. Then add very obvious soft barriers like light swinging bars to indicate the lower boundary. That would encourage anyone driving anything that might actually hit the hard limit to take an alternate route. (Of course, that means there…

" it’s not practical here. There are many overheight trucks that have to be able to drive right up to the bridge and turn onto Peabody St. in order to deliver supplies to several restaurants. Making Peabody St inaccessible from Gregson St would make the restaurant owners and the delivery drivers very unhappy." [1] at the end of the it seems most of the trucks are often Rental Trucks drive by people that likely should…

I think the parent comment may be suggesting to low the limit on the bridge even more, like adding a wall to the underside of it, so that it's obvious nothing higher than normal cars or perhaps a large van would fit.

Then again, maybe a large portion of the crashes are from people who forget they're driving a truck, so that might just make the carnage worse...

Re: 11 Foot 8 – The Can-opener Bridge

#102

Post by userbinator »

syshum wrote: post #92
aidenn0 wrote: post #25

Earlier quoted context omitted.

This is America. People have pickup trucks that have been raised to a height above 2m (about 6'6" in American)

A stock F-250 4x4 can be has high as 6'8" from the factory with out being lifted A factory 2020 F-150 4x4 is 6'5" from the factory[1] So I think you have you underestimation of the size of a truck. A common Lift would be 4in, and can go to 8in. Your attempting to paint a picture of a "redneck" truck would be be a fully lifted, when lifting the truck you would then also add larger tires that would further lift the tru…

I guess the trick is to find a height that is high enough to let those through, but also low enough that it would look too low for the large box trucks and such which often crash into it. Perhaps 9' or 10'?

Re: 11 Foot 8 – The Can-opener Bridge

#104

Post by LegitShady »

teraflop wrote: post #9
hattar wrote: post #7

Why not place an arch before the bridge that will impact but not damage vehicles going through? This exists in the entrance to most parking garages. Edit: like this https://www.jpsiteexperts.com/wp-content/uploads/2014/04/cle...

Placing an obstacle between the bridge and the intersection would be fairly pointless, because once you hit it, it would be too late to stop before hitting the bridge. (EDIT: in addition, a hanging warning sign would have to be suspended from something. My guess is any such structure would need to be made very sturdy and expensive, or else it would just get knocked down and increase the hazard to pedestrians and prop…

Look at the video. Such a structure already exists. There is a yellow beam meant to protect the bridge right in front of it. It probably does most of the can openjng to spare the bridge

Re: 11 Foot 8 – The Can-opener Bridge

#105

Post by loeg »

Invictus0 wrote: post #69
Animats wrote: post #53

The Sidney Harbor Tunnel had a similar problem. They came up with an elaborate but successful solution.[1] There are detectors and huge flashing warning signs that light up. Then, there's the last-chance sign. At the entrance to the tunnel, pumps force a curtain of water straight down across the entire roadway. Then a powerful laser system projects a giant octagonal red STOP sign onto the water curtain, filling the e…

Why cant they put a swinging bar at the tunnel height some distance before the tunnel? The bar knocks the top of the truck and wakes up whoever is driving to the fact that the truck is too tall.

Or a wedge barrier: https://eci-illinois.com/wedge-barrier-versus-medium-size-tr...

Re: 11 Foot 8 – The Can-opener Bridge

#106

Post by quickthrower2 »

Animats wrote: post #53

The Sidney Harbor Tunnel had a similar problem. They came up with an elaborate but successful solution.[1] There are detectors and huge flashing warning signs that light up. Then, there's the last-chance sign. At the entrance to the tunnel, pumps force a curtain of water straight down across the entire roadway. Then a powerful laser system projects a giant octagonal red STOP sign onto the water curtain, filling the e…

If traffic to that tunnel were to get blocked at say 6am, expect mayhem across many routes in Sydney as that backs up, people take alternative routes along the harbour bridge and lower traffic bridges. The topography and indeed topology doesn't really like this tunnel to be out of use!

Re: 11 Foot 8 – The Can-opener Bridge

#107

Post by [deleted] »

userbinator wrote: post #102
syshum wrote: post #92

Earlier quoted context omitted.

A stock F-250 4x4 can be has high as 6'8" from the factory with out being lifted A factory 2020 F-150 4x4 is 6'5" from the factory[1] So I think you have you underestimation of the size of a truck. A common Lift would be 4in, and can go to 8in. Your attempting to paint a picture of a "redneck" truck would be be a fully lifted, when lifting the truck you would then also add larger tires that would further lift the tru…

I guess the trick is to find a height that is high enough to let those through, but also low enough that it would look too low for the large box trucks and such which often crash into it. Perhaps 9' or 10'?

[deleted]

Re: 11 Foot 8 – The Can-opener Bridge

#110

Post by notatoad »

loeg wrote: post #105
Invictus0 wrote: post #69

Earlier quoted context omitted.

Why cant they put a swinging bar at the tunnel height some distance before the tunnel? The bar knocks the top of the truck and wakes up whoever is driving to the fact that the truck is too tall.

Or a wedge barrier: https://eci-illinois.com/wedge-barrier-versus-medium-size-tr...

i think the point is to prevent damage to trucks, not to completely destroy them
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