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Author Topic: How do you measure the height of this bridge?  (Read 1824 times)

tolbs17

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How do you measure the height of this bridge?
« on: January 14, 2022, 09:48:21 PM »

I want to know how high this bridge is. If it's lower than 16 feet, then I-587 can't be signed on it.

I-40 ALT
https://maps.app.goo.gl/K7JK21sMxjaLk64S7
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Max Rockatansky

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Re: How do you measure the height of this bridge?
« Reply #1 on: January 15, 2022, 12:06:42 AM »

Whip out a ruler and measure.  Donít forget the two inch rule.
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SkyPesos

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Re: How do you measure the height of this bridge?
« Reply #2 on: January 15, 2022, 12:25:14 AM »

I want to know how high this bridge is. If it's lower than 16 feet, then I-587 can't be signed on it.

I-40 ALT
https://maps.app.goo.gl/K7JK21sMxjaLk64S7
What? Plenty of overpasses with a clearance of between 14 and 16 ft exist on interstate highways.
« Last Edit: January 15, 2022, 09:23:23 AM by SkyPesos »
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Fundamental Theorem of AARoads - Let "y" represent the elevation above sea level in a certain area. If "Δy" between the highest and lowest values of y equals to 0, it's Illinois.

tolbs17

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Re: How do you measure the height of this bridge?
« Reply #3 on: January 15, 2022, 12:38:21 AM »

I want to know how high this bridge is. If it's lower than 16 feet, then I-587 can't be signed on it.

I-40 ALT
https://maps.app.goo.gl/K7JK21sMxjaLk64S7
What? Plenty of overpasses with a clearance of between 14 and 16 inches exist on interstate highways.
From Wikipedia...

https://en.m.wikipedia.org/wiki/Interstate_Highway_standards#:~:text=Vertical%20clearance%3A%20The%20minimum%20vertical,for%20extra%20layers%20of%20pavement.&text=The%20cross%20bracing%20of%20truss,17.5%20feet%20(5.3%20m).

Quote
Vertical clearance: The minimum vertical clearance under overhead structures, such as bridges, is 16 feet (4.9 m), including both paved shoulders and an allowance for extra layers of pavement. Through urban areas, at least one routing is to have 16-foot (4.9 m) clearances, but others may have a lesser clearance of 14 feet (4.3 m). Sign supports and pedestrian overpasses must be at least 17 feet (5.2 m) above the road, except on urban routes with lesser clearance, where they should be at least 1 foot (30 cm) higher than other objects. The cross bracing of truss bridges has a special additional clearance requirement of 17.5 feet (5.3 m).
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CtrlAltDel

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Re: How do you measure the height of this bridge?
« Reply #4 on: January 15, 2022, 01:04:36 AM »

Plenty of overpasses with a clearance of between 14 and 16 inches exist on interstate highways.

I'm not so sure that's true.  :-D
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Max Rockatansky

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Re: How do you measure the height of this bridge?
« Reply #5 on: January 15, 2022, 01:13:20 AM »

Plenty of overpasses with a clearance of between 14 and 16 inches exist on interstate highways.

I'm not so sure that's true.  :-D

Itís not the size of the bridge that counts, itís how you use it.
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tolbs17

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Re: How do you measure the height of this bridge?
« Reply #6 on: January 15, 2022, 01:18:04 AM »

Reason why I asked this question is because LM117 said they're too low.
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wanderer2575

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Re: How do you measure the height of this bridge?
« Reply #7 on: January 15, 2022, 01:20:11 AM »

I knew this was a tolbs17 thread just by the topic name.
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Max Rockatansky

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Re: How do you measure the height of this bridge?
« Reply #8 on: January 15, 2022, 09:07:20 AM »

Reason why I asked this question is because LM117 said they're too low.

Did you compare your bridge heights?  Some bridges donít look the same you know.
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SkyPesos

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Re: How do you measure the height of this bridge?
« Reply #9 on: January 15, 2022, 09:27:19 AM »

Plenty of overpasses with a clearance of between 14 and 16 inches exist on interstate highways.

I'm not so sure that's true.  :-D
I forgot weíre talking about highways for cars here, not highways for cats  :-D
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My Fictional Highways

Fundamental Theorem of AARoads - Let "y" represent the elevation above sea level in a certain area. If "Δy" between the highest and lowest values of y equals to 0, it's Illinois.

jeffandnicole

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Re: How do you measure the height of this bridge?
« Reply #10 on: January 15, 2022, 11:46:19 AM »

This may be one of my favorite.  295 South at the Aljo curve. Right lane (which is the far right lane against the barrier) during construction...13' 7". No advanced warning. Some truckers get a little nervous when they approach this overpass when they see the signs at the last moment. 
https://maps.app.goo.gl/1yfP53jkopSJzc7j7



I want to know how high this bridge is. If it's lower than 16 feet, then I-587 can't be signed on it.

I-40 ALT
https://maps.app.goo.gl/K7JK21sMxjaLk64S7

Look up an online database for bridges. They usually include a clearance height.  If they want to give a highway interstate status, exceptions can be made.
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tolbs17

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Re: How do you measure the height of this bridge?
« Reply #11 on: January 15, 2022, 04:47:04 PM »

Or NCDOT can be like SCDOT or TxDOT and mount bridge clearances on the overpasses. Just saying that because I can't find a map of how high and low the bridges are in North Carolina.
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SteveG1988

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Re: How do you measure the height of this bridge?
« Reply #12 on: January 16, 2022, 03:49:36 PM »

I want to know how high this bridge is. If it's lower than 16 feet, then I-587 can't be signed on it.

I-40 ALT
https://maps.app.goo.gl/K7JK21sMxjaLk64S7
Some states don't post certain heights, like if it is unposted in IL on like US30 it is 13-6 or above.
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dlsterner

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Re: How do you measure the height of this bridge?
« Reply #13 on: January 16, 2022, 04:27:36 PM »

I want to know how high this bridge is. If it's lower than 16 feet, then I-587 can't be signed on it.

I-40 ALT
https://maps.app.goo.gl/K7JK21sMxjaLk64S7

It's simple.
  • Rent a handful of box trucks, in varying heights, from your favorite vehicle rental company.
  • Measure and record the heights of all of the trucks.
  • Start with the shortest truck.
  • Drive it under the bridge.
  • If the bridge scalps the truck (like in https://www.11foot8.com) then the height of the bridge is between the height of this truck and the height of the previous truck.  It is acceptable to use the height of the previous truck.  You are done.
  • Otherwise, repeat the above with the next taller truck.
  • Record the height of the tallest truck that wasn't scalped.
  • Come up with a story to explain the scalped truck to the rental company.
You're welcome.   :bigass:

Big John

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Re: How do you measure the height of this bridge?
« Reply #14 on: January 16, 2022, 04:38:46 PM »

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dlsterner

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Re: How do you measure the height of this bridge?
« Reply #15 on: January 16, 2022, 04:45:26 PM »

^^ Reminds me of this: https://www.gocomics.com/calvinandhobbes/1986/11/26
Yes, that very comic strip is where I got the inspiration for my post   :bigass:

triplemultiplex

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Re: How do you measure the height of this bridge?
« Reply #16 on: January 19, 2022, 12:35:19 PM »

How do you measure the height of this bridge?



Alternatively, the company I work for can do it with LiDAR.  Vertical Clearance Measurement for overhead structures is sometimes a deliverable for our customers.
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