National Boards > Bridges

How do you measure the height of this bridge?

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tolbs17:
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

Max Rockatansky:
Whip out a ruler and measure.  Donít forget the two inch rule.

SkyPesos:

--- Quote from: tolbs17 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

--- End quote ---
What? Plenty of overpasses with a clearance of between 14 and 16 ft exist on interstate highways.

tolbs17:

--- Quote from: SkyPesos on January 15, 2022, 12:25:14 AM ---
--- Quote from: tolbs17 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

--- End quote ---
What? Plenty of overpasses with a clearance of between 14 and 16 inches exist on interstate highways.

--- End quote ---
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).
--- End quote ---

CtrlAltDel:

--- Quote from: SkyPesos on January 15, 2022, 12:25:14 AM ---Plenty of overpasses with a clearance of between 14 and 16 inches exist on interstate highways.

--- End quote ---

I'm not so sure that's true.  :-D

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