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Sydney tunnel water screen stop sign for oversized vehicles [video]

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Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#11

Post by ChuckMcM »

bluedevil2k wrote: post #2

It's a really cool idea, but I couldn't help but think they should move the water stop sign to well BEFORE the million dollar damage point. Some big trucks would have a hard time seeing the stop sign, reacting to it, slamming on the brakes, and coming to a complete stop in time before they cause damage to the overhang and beams.

That and apparently some active enforcement about load heights. Load height is one of the things that is checked and enforced at truck inspection stops on US highways and interstates for this exact reason (to try to prevent over tall loads from damaging bridges).

Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#12

Post by narcissus »

aashaykumar92 wrote: post #7

What a neat idea! But if these trucks are PURPOSEFULLY breaking the laws and continuing to go through the tunnel, I am not sure that this solution will hold up for too long; after all, the clever truck drivers will know it is a mere illusion. Furthermore, instead of a water screen, wouldn't a brick screen be more effective? Personally, I wouldn't mind going through water nearly as much as I would be running into a br…

I don't think the water is used to make the driver think he's about to drive into a wall of water: I figured the water is used as a medium for projecting the huge stop sign in front of them?

Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#13

Post by sdfjkl »

aashaykumar92 wrote: post #7

What a neat idea! But if these trucks are PURPOSEFULLY breaking the laws and continuing to go through the tunnel, I am not sure that this solution will hold up for too long; after all, the clever truck drivers will know it is a mere illusion. Furthermore, instead of a water screen, wouldn't a brick screen be more effective? Personally, I wouldn't mind going through water nearly as much as I would be running into a br…

Err, they're not going through the tunnel. They're too tall for it. They crash into the roof of the tunnel, causing severe damage to the infrastructure, their trucks and anyone who happens to pass by.

Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#14

Post by [deleted] »

aashaykumar92 wrote: post #7

What a neat idea! But if these trucks are PURPOSEFULLY breaking the laws and continuing to go through the tunnel, I am not sure that this solution will hold up for too long; after all, the clever truck drivers will know it is a mere illusion. Furthermore, instead of a water screen, wouldn't a brick screen be more effective? Personally, I wouldn't mind going through water nearly as much as I would be running into a br…

[deleted]

Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#15

Post by [deleted] »

aashaykumar92 wrote: post #7

What a neat idea! But if these trucks are PURPOSEFULLY breaking the laws and continuing to go through the tunnel, I am not sure that this solution will hold up for too long; after all, the clever truck drivers will know it is a mere illusion. Furthermore, instead of a water screen, wouldn't a brick screen be more effective? Personally, I wouldn't mind going through water nearly as much as I would be running into a br…

[deleted]

Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#16

Post by chris_wot »

mootothemax wrote: post #8
bluedevil2k wrote: post #2

It's a really cool idea, but I couldn't help but think they should move the water stop sign to well BEFORE the million dollar damage point. Some big trucks would have a hard time seeing the stop sign, reacting to it, slamming on the brakes, and coming to a complete stop in time before they cause damage to the overhang and beams.

It's a really cool idea, but I couldn't help but think they should move the water stop sign to well BEFORE the million dollar damage point I thought the stop sign was only visible because of the dark background (i.e. moderately lit tunnel) behind it? My first thought was similar - it needs to be seen sooner - but I presume that even some braking before slamming into concrete is better than none.

You mean, before the 3 flashing stop signs BEFORE he got to that point?

A better idea might be a low bar that causes the truck damage well before they reach the tunnel. Only issue is how to make it safe and very obvious it's done the truck damage?

Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#18

Post by Achshar »

mootothemax wrote: post #8
bluedevil2k wrote: post #2

It's a really cool idea, but I couldn't help but think they should move the water stop sign to well BEFORE the million dollar damage point. Some big trucks would have a hard time seeing the stop sign, reacting to it, slamming on the brakes, and coming to a complete stop in time before they cause damage to the overhang and beams.

It's a really cool idea, but I couldn't help but think they should move the water stop sign to well BEFORE the million dollar damage point I thought the stop sign was only visible because of the dark background (i.e. moderately lit tunnel) behind it? My first thought was similar - it needs to be seen sooner - but I presume that even some braking before slamming into concrete is better than none.

I think they actually shut down the lights in the tunnel before the screen goes off. You can see it in the video when the lights go off and tunnel is suddenly much darker.

Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#19

Post by chris_wot »

Smerity wrote: post #4
bluedevil2k wrote: post #2

It's a really cool idea, but I couldn't help but think they should move the water stop sign to well BEFORE the million dollar damage point. Some big trucks would have a hard time seeing the stop sign, reacting to it, slamming on the brakes, and coming to a complete stop in time before they cause damage to the overhang and beams.

The advantage with the signs before the final water sign is that they should be enough for any reasonably alert driver and don't make the environment more hazardous. You really want to have the water screen projection, which douses the road with water, as the last line of defence. Water on the road is likely to make it far more difficult to stop a large truck like that. Having it earlier could actually be detrimental…

Better a wall of water than a truck crashing into the tunnel!

Re: Sydney tunnel water screen stop sign for oversized vehicles [video]

#20

Post by smackfu »

chris_wot wrote: post #16
mootothemax wrote: post #8

Earlier quoted context omitted.

It's a really cool idea, but I couldn't help but think they should move the water stop sign to well BEFORE the million dollar damage point I thought the stop sign was only visible because of the dark background (i.e. moderately lit tunnel) behind it? My first thought was similar - it needs to be seen sooner - but I presume that even some braking before slamming into concrete is better than none.

You mean, before the 3 flashing stop signs BEFORE he got to that point? A better idea might be a low bar that causes the truck damage well before they reach the tunnel. Only issue is how to make it safe and very obvious it's done the truck damage?

The problem with a barrier that is hit is that you need to make sure it is structurally sound before you allow any other traffic past it. And if it leaves debris on the road, that needs to be cleaned up too. It's already a slow process to back out the oversized truck, so you don't want countermeasures that make it even slower.
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