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.
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
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
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.
Here are the actual names of the gantry types.
(https://i.imgur.com/Dd81fg3.png)
Oklahoma has traditionally used a Pratt truss.
(https://i.imgur.com/GBDrq9B.jpg)
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.
(https://i.imgur.com/08d04ag.jpg)
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.
https://www.aaroads.com/forum/index.php?topic=21307.0
Quote from: SkyPesos on February 02, 2022, 04:16:06 PM
https://www.aaroads.com/forum/index.php?topic=21307.0
Probably didn't see that.
So should we merge this thread?
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.
Quote from: SignBridge on February 14, 2022, 09:22:59 PM
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.
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.
A REALLY old NC full gantry - https://goo.gl/maps/NFcekGrZuVZTxa6P9
Quote from: tolbs17 on February 15, 2022, 08:36:39 PM
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.