Your state's highway gantries and cantilevers

[tolbs17]

For North Carolina

Full gantries

A VERY old triangle - https://goo.gl/maps/bLjNrb1cfRhUKiTk9

2000s era square - https://goo.gl/maps/V8DBwdgzfRCWr4aV9

2000s era triangle - https://goo.gl/maps/3iLagv5yGf4JTqgT7

Square - https://goo.gl/maps/RjicmwW4sE3Cpw8L6 and - https://goo.gl/maps/t1XULVrMJKLvrqXw5

Triangle - https://goo.gl/maps/tyoqqzFToK2pULoz6

Cantilever

A VERY old one - https://goo.gl/maps/Sde4tdmwMW7NTmNm8

Early 90s - https://goo.gl/maps/Vx8K4w7h7dzDjri59

Mid to late 2000s - https://goo.gl/maps/sxo4yb6dk7xxEQMK6

Early 2010s - https://goo.gl/maps/5VAGErrNVc1inSz67

Present day - https://goo.gl/maps/LKUUHeKhpYLXvK1VA and https://goo.gl/maps/yh7m2QV1WrdejQTn9

The triangle full trusses look the nicest to me.

[MATraveler128]

In Massachusetts

This giant triangle cantilever sign I-495 south Exit 89

https://www.google.com/maps/@42.6098443,-71.3126656,3a,27.4y,260.42h,91.22t/data=!3m7!1e1!3m5!1svZYnsnfuR3zqXLWgi7TnHg!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DvZYnsnfuR3zqXLWgi7TnHg%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D287.01056%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192

This design here I-95 north Exit 58

https://www.google.com/maps/@42.5206823,-71.0866122,3a,75y,73.36h,103.54t/data=!3m6!1e1!3m4!1sPRLy8FQdWKhlVPaaT4E4uQ!2e0!7i16384!8i8192

This smaller triangle cantilever I-93 south Exit 23

https://www.google.com/maps/@42.4225217,-71.1038106,3a,43.3y,199.6h,95.1t/data=!3m6!1e1!3m4!1s3Q_on9xZLmo33P7TdRBNWw!2e0!7i16384!8i8192

This square cantilever design I-90 west Exit 123

https://www.google.com/maps/@42.3470552,-71.2359115,3a,27y,287.61h,95.93t/data=!3m6!1e1!3m4!1sWJvXADYCAG_LD-sxyTfsJA!2e0!7i16384!8i8192

And finally, these ground mount signs on the Cape US 6 east Exit 78 (ignore the Exit 9, this was taken in October 2019)

https://www.google.com/maps/@41.6958963,-70.1595264,3a,41.2y,64.83h,89.17t/data=!3m7!1e1!3m5!1siViI0jQi5y3bR0m6_dkbmQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DiViI0jQi5y3bR0m6_dkbmQ%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D205.22176%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192

[Henry]

IL:

Brown full--
https://www.google.com/maps/@41.8500637,-87.6449348,3a,75y,286.44h,90t/data=!3m7!1e1!3m5!1sG5Dmit0JKWtl-fyTKUVhKQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DG5Dmit0JKWtl-fyTKUVhKQ%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D291.60648%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192
Brown cantilever--
https://www.google.com/maps/@41.8635414,-87.6442601,3a,15y,6.1h,95.13t/data=!3m6!1e1!3m4!1sCa6SgS6XGptHTL95H3Gghg!2e0!7i16384!8i8192
Both full and cantilever in same location--
https://www.google.com/maps/@41.8504856,-87.6445023,3a,58.1y,346.89h,90.08t/data=!3m6!1e1!3m4!1sa7FRyjtc14Y1cX_rqb8P9Q!2e0!7i16384!8i8192

Gray full--
https://www.google.com/maps/@41.8438818,-87.6552696,3a,75y,238.88h,94.16t/data=!3m6!1e1!3m4!1sv9xV7kqzUAhb7Y83xhgueg!2e0!7i16384!8i8192
Newer gray full--
https://www.google.com/maps/@41.8752995,-87.6485065,3a,75y,152.69h,153.77t/data=!3m6!1e1!3m4!1sa5DmQr88wavIHX9gdM4INg!2e0!7i16384!8i8192
Gray cantilever--
https://www.google.com/maps/@41.8752995,-87.6485065,3a,75y,152.69h,153.77t/data=!3m6!1e1!3m4!1sa5DmQr88wavIHX9gdM4INg!2e0!7i16384!8i8192

[roadman65]

Florida
https://goo.gl/maps/KTWUjAGWbbV65ah67
For Tampa area.

https://goo.gl/maps/kp9wBYNse5w8FLoX6 Move away from Downtown this is a typical FDOT cantilever.

https://goo.gl/maps/qihYSz5SjGvtyQsMA  Sometimes used for two panels.


https://goo.gl/maps/M1N7JYUNwdULfXjc6 Simple FDOT gantries.

https://goo.gl/maps/rs7CZopaivjYgXFP6 The most common in our state.

[Scott5114]

Here are the actual names of the gantry types.



Oklahoma has traditionally used a Pratt truss.


Newer installs include two horizontal members across the length of the truss. I believe these are not actual structural members, but instead handrails for a catwalk inside the truss structure.


The newest installs use monotubes. So far, these have tended to be limited to urban areas; new Pratt trusses are still installed in more rural areas as needed.

[SkyPesos]

https://www.aaroads.com/forum/index.php?topic=21307.0

[tolbs17]

https://www.aaroads.com/forum/index.php?topic=21307.0

Probably didn't see that.

So should we merge this thread?

[SignBridge]

New York State for many years starting in the 1960's used large triangular trusses. Many of those are now reaching the end of their service life and are gradually being replaced with large box trusses. Don't know the reason why they're changing from one type to the other.

[vdeane]

New York State for many years starting in the 1960's used large triangular trusses. Many of those are now reaching the end of their service life and are gradually being replaced with large box trusses. Don't know the reason why they're changing from one type to the other.

IIRC, the triangular ones are fracture critical.

[Scott5114]

Triangular gantries always struck me as being less versatile than square ones. I know some states can and do install signs safely on the back of the triangular ones, but it always looks a lot more precarious than having the panel back flush with a square gantry.

[tolbs17]

A REALLY old NC full gantry - https://goo.gl/maps/NFcekGrZuVZTxa6P9

[SignBridge]

A REALLY old NC full gantry - https://goo.gl/maps/NFcekGrZuVZTxa6P9

Interesting; New York State used that type of gantry also,  before they went to the triangular ones. I assume they proved inadequate re: wind loading.