What types of BGS mounts do they use in your states?
Missouri uses the standard open rafter like mount.
https://goo.gl/maps/FbrSXwd2LPS2 (https://goo.gl/maps/FbrSXwd2LPS2)
Virginia uses various ones but they're all for the most part similar to your standard example.
I've always loved the ones on the Charleston (WV) expressways though. I-95 in Baltimore had similar ones but they're all gone except right at the tunnel. I wonder why MD felt the need to replace those?
Arizona used to use truss gantries but now uses tubular gantries. However, many truss gantries still remain in place.
These 2 examples pretty much sums up what NJDOT uses.
https://goo.gl/maps/MaHTndgPTc52
https://goo.gl/maps/KogZCwfHYAw
WashDOT uses this cheap box-type monotube for all installations (full and partial width), and has been using this gantry style for over 25 years.
They're typically unpainted, but painted gantries are becoming more common. Those are often brown or green; this strange peach/tan color was used along I-705 back in the late 80s (last photo).
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fxvkb2CP.png&hash=41a67d352e8dba2b0f7540c084b13ac616c246f5) (https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FZy2Samx.png&hash=b8480e84d8eae4c8157b35a7c259c3204f3e67ad)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fcfn6CqQ.png&hash=96510efe8f55721cb32c79b10dd3c2ec60fcec8a) (https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FqkI0yCz.png&hash=af5d628540269bce0da506cb50ef7baed06ec692)
British Columbia's MOTI uses traditional monotubes (though much more rigid in appearance). Partial-width raised gantry signs are very rare. Most overhead signage is APL (which requires full-width gantries).
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Ft9KsBfR.png&hash=2b85090ba7bdf9338adcf7af3b241a140a5fe754)
From what I've seen, NCDOT only uses truss gantries, and does not have a standard gantry, (correct me if i'm wrong) like FDOT and some other DOTs do. I've seen a variety of different looking truss gantries.
MassDOT only provides general specifications (such as wind design speed) for BGS overhead structure design, and leaves the exact support design up to the fabricator, subject to review and approval of the calculations and drawings by either MassDOT or the project designer. The only exception to this policy was for the Big Dig project, where monotube supports were specified for purely aesthetic reasons (remember that Big Dig = $21 billion beautification project with a highway component). In that case, very specific design requirements were provided to the fabricator for the supports, with the result that the sign panels had to be specifically designed not to exceed the maximum loading of the supports (i.e. total opposite of standard BGS and gantry design practice).
As a result, sign support structures on Massachusetts highways are a combination of single chord supports, trichords, and box truss structures. The most common cantilever design these days is a box truss member on a single post upright. Monotubes are generally not used for cost reasons, and are also considered impractical for longer spans due to the camber requirements and lack of redundancy (unlike trichords or box trusses) if they get struck.
I believe Kansas' overheads are called box truss gantries, but I might have my terminology wrong.
Quote from: kphoger on March 09, 2017, 12:35:29 PM
I believe Kansas' overheads are called box truss gantries, but I might have my terminology wrong.
You have it right. In the sign support world, "box truss" normally refers to a four-chord open truss structure, which are the type of sign structures I've seen in most photos and GSV views of Kansas highways I've viewed. Some agencies also use the term to describe an enclosed fabricated rectangular support - like the sign supports used on Boston's original elevated Central Artery.
Does anyone know what these are?
https://goo.gl/maps/SULkBo19Kew
Perhaps I'm misremembering, but I think they used to be a little more common across Pennsylvania, but the one linked above is the only one I've noticed in recent years.
Quote from: briantroutman on March 09, 2017, 01:30:16 PM
Does anyone know what these are?
https://goo.gl/maps/SULkBo19Kew
Perhaps I'm misremembering, but I think they used to be a little more common across Pennsylvania, but the one linked above is the only one I've noticed in recent years.
That looks like a box truss gantry, similar to Kansas.
Illinois uses mainly truss gantries:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages294%2Fi-294_il_st_45.jpg&hash=40e8c95d5c991c9876113e5c32d3c1a2a29732d6)
But inter-mixed in Chicagoland you have brown beams:
(https://www.interstate-guide.com/images190/i-190_il_wt_07.jpg)
It should be noted that there are multiple types of truss:
(https://www.researchgate.net/profile/Michael_Fenton/publication/259575898/figure/fig1/AS:296970578087939@1447814711753/Fig-4-Basic-truss-designs.png)
Missouri uses a Pratt truss. Illinois uses either a Warren or a Vierendeel. Minnesota uses a modified Warren.
The Kansas "box truss" (also in use in Arkansas, New York, and others) uses two modified Warrens, one of which is flipped 180° from the other, and connected by 45° braces:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FWvwQpd4.jpg&hash=1a66872f02cac6f5fea79f2bb4dfcf483c265286)
Quote from: plain on March 07, 2017, 12:50:35 PM
Virginia uses various ones but they're all for the most part similar to your standard example.
I've always loved the ones on the Charleston (WV) expressways though. I-95 in Baltimore had similar ones but they're all gone except right at the tunnel. I wonder why MD felt the need to replace those?
Because all of I-95 in Baltimore City is maintained by the Maryland Transportation Authority (MdTA), which is very aggressive when it comes to replacing signs. Those structures can also be found on I-83 in Baltimore City.
Quote from: Scott5114 on March 10, 2017, 02:32:37 AM
It should be noted that there are multiple types of truss:
(https://www.researchgate.net/profile/Michael_Fenton/publication/259575898/figure/fig1/AS:296970578087939@1447814711753/Fig-4-Basic-truss-designs.png)
Missouri uses a Pratt truss. Illinois uses either a Warren or a Vierendeel. Minnesota uses a modified Warren.
The Kansas "box truss" (also in use in Arkansas, New York, and others) uses two modified Warrens, one of which is flipped 180° from the other, and connected by 45° braces:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FWvwQpd4.jpg&hash=1a66872f02cac6f5fea79f2bb4dfcf483c265286)
Thank you
very much for that explanation. That's practically sticky-worthy.
Quote from: kphoger on March 09, 2017, 04:42:53 PM
Quote from: briantroutman on March 09, 2017, 01:30:16 PM
Does anyone know what these are?
https://goo.gl/maps/SULkBo19Kew
Perhaps I’m misremembering, but I think they used to be a little more common across Pennsylvania, but the one linked above is the only one I’ve noticed in recent years.
That looks like a box truss gantry, similar to Kansas.
Correct. It is a box truss gantry with modified tri-chord uprights. Very unusual design that I've only seen in Pennsylvania. They may also be aluminum structures, which would explain the unusual uprights.
Quote from: ET21 on March 10, 2017, 12:19:32 AM
Illinois uses mainly truss gantries:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages294%2Fi-294_il_st_45.jpg&hash=40e8c95d5c991c9876113e5c32d3c1a2a29732d6)
But inter-mixed in Chicagoland you have brown beams:
(https://www.interstate-guide.com/images190/i-190_il_wt_07.jpg)
Around St Louis the brown beams make quite the appearance. https://goo.gl/maps/T7p2HZjBJ5v (https://goo.gl/maps/T7p2HZjBJ5v)
Quote from: jakeroot on March 07, 2017, 01:48:07 PM
WashDOT uses this cheap box-type monotube for all installations (full and partial width), and has been using this gantry style for over 25 years.
They're typically unpainted, but painted gantries are becoming more common. Those are often brown or green; this strange peach/tan color was used along I-705 back in the late 80s (last photo).
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fxvkb2CP.png&hash=41a67d352e8dba2b0f7540c084b13ac616c246f5) (https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FZy2Samx.png&hash=b8480e84d8eae4c8157b35a7c259c3204f3e67ad)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fcfn6CqQ.png&hash=96510efe8f55721cb32c79b10dd3c2ec60fcec8a) (https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FqkI0yCz.png&hash=af5d628540269bce0da506cb50ef7baed06ec692)
British Columbia's MOTI uses traditional monotubes (though much more rigid in appearance). Partial-width raised gantry signs are very rare. Most overhead signage is APL (which requires full-width gantries).
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Ft9KsBfR.png&hash=2b85090ba7bdf9338adcf7af3b241a140a5fe754)
I really like the box monotube design. Especially when painted.
Minnesota used to use the Pratt truss; you can still see a few around the Twin Cities area.
Quote from: ColossalBlocks on March 13, 2017, 07:09:00 PM
Quote from: ET21 on March 10, 2017, 12:19:32 AM
Illinois uses mainly truss gantries:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages294%2Fi-294_il_st_45.jpg&hash=40e8c95d5c991c9876113e5c32d3c1a2a29732d6)
But inter-mixed in Chicagoland you have brown beams:
(https://www.interstate-guide.com/images190/i-190_il_wt_07.jpg)
Around St Louis the brown beams make quite the appearance. https://goo.gl/maps/T7p2HZjBJ5v (https://goo.gl/maps/T7p2HZjBJ5v)
IDOT generally uses the brown gantries (Not a fan personally of them), while ISTHA uses standard truss. However, they've been using box gantries with concrete pillars more recently, as seen here (https://www.google.com/maps/@42.4456772,-87.9577404,3a,75y,346.8h,89.23t/data=!3m6!1e1!3m4!1s8ilhyygIYJFlcUkXalmMBQ!2e0!7i13312!8i6656).
While watching a first season episode of CHiPs (1977) a little while ago I noticed at least 2 monotube style gantries. (Both painted a tan-beige color.) I did not realise that CalTrans was using those so long ago. The first time I ever remember actually seeing that style of gantry anywhere was in the mid '80's on the Blackstone Freeway in Fresno. ("Painted" that sort of "rust/brown" color/texture.)
As a side note, there are a VERY few of this style of gantry in Washington state. (Painted grey.) I really like this style of gantry and wish Oregon used it. I find it much preferable either to Washington's "box tube" gantry or Oregon's (I'm not really sure what you would call it but it ain't attractive) style.
Quote from: JoePCool14 on March 15, 2017, 09:23:12 AM
Quote from: ColossalBlocks on March 13, 2017, 07:09:00 PM
Quote from: ET21 on March 10, 2017, 12:19:32 AM
Illinois uses mainly truss gantries:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages294%2Fi-294_il_st_45.jpg&hash=40e8c95d5c991c9876113e5c32d3c1a2a29732d6)
But inter-mixed in Chicagoland you have brown beams:
(https://www.interstate-guide.com/images190/i-190_il_wt_07.jpg)
Around St Louis the brown beams make quite the appearance. https://goo.gl/maps/T7p2HZjBJ5v (https://goo.gl/maps/T7p2HZjBJ5v)
IDOT generally uses the brown gantries (Not a fan personally of them), while ISTHA uses standard truss. However, they've been using box gantries with concrete pillars more recently, as seen here (https://www.google.com/maps/@42.4456772,-87.9577404,3a,75y,346.8h,89.23t/data=!3m6!1e1!3m4!1s8ilhyygIYJFlcUkXalmMBQ!2e0!7i13312!8i6656).
Those seem to be placed randomly. I don't know if their for public input or a trend of what's to come. Some of those are gonna get demolished when the Central Tri-State gets rebuilt
Quote from: ET21 on March 22, 2017, 09:03:21 PM
Quote from: JoePCool14 on March 15, 2017, 09:23:12 AM
Quote from: ColossalBlocks on March 13, 2017, 07:09:00 PM
Quote from: ET21 on March 10, 2017, 12:19:32 AM
Illinois uses mainly truss gantries:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages294%2Fi-294_il_st_45.jpg&hash=40e8c95d5c991c9876113e5c32d3c1a2a29732d6)
But inter-mixed in Chicagoland you have brown beams:
(https://www.interstate-guide.com/images190/i-190_il_wt_07.jpg)
Around St Louis the brown beams make quite the appearance. https://goo.gl/maps/T7p2HZjBJ5v (https://goo.gl/maps/T7p2HZjBJ5v)
IDOT generally uses the brown gantries (Not a fan personally of them), while ISTHA uses standard truss. However, they've been using box gantries with concrete pillars more recently, as seen here (https://www.google.com/maps/@42.4456772,-87.9577404,3a,75y,346.8h,89.23t/data=!3m6!1e1!3m4!1s8ilhyygIYJFlcUkXalmMBQ!2e0!7i13312!8i6656).
Those seem to be placed randomly. I don't know if their for public input or a trend of what's to come. Some of those are gonna get demolished when the Central Tri-State gets rebuilt
ISTHA was probably trying to be a WisDOT wannabe, but they aren't nearly as good. WisDOT ones actually have a design and are colored differently. ISTHA's are boring cylinders. I'm not sure what their intent was, but it honestly seems kinda pointless at the moment.
There are 3 common types of overhead sign structures in use by Caltrans...
1. Truss (more specifically a Pratt truss)
(https://www.aaroads.com/california/images680/i-680_nb_exit_030a_04.jpg)
This is, by far, the most common gantry seen in California.
2. Box Beam
(https://www.aaroads.com/california/images680/i-680_nb_exit_002a_01.jpg)
While still pretty common on freeways in the San Francisco Bay Area, the Box Beam gantry was removed from Caltrans' standard plans in the early 2000's but many remain in the field.
3. Monotubes
(https://www.aaroads.com/california/images680/i-680_nb_exit_046a_01.jpg)
Monotubes are IMO, the least common of the 3 types of gantries seen in California but as the Box Beams are phased out, this style of gantry and the Pratt truss will be the only overhead sign structures left in Caltrans' standard plans.
For some other states, New Mexico uses monotubes. Nevada I think uses Pratt truss. Texas however seems to vary by district, with the El Paso district using monotubes as standard but other districts using truss.
Quote from: JoePCool14 on March 15, 2017, 09:23:12 AM
Quote from: ColossalBlocks on March 13, 2017, 07:09:00 PM
Quote from: ET21 on March 10, 2017, 12:19:32 AM
Illinois uses mainly truss gantries:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages294%2Fi-294_il_st_45.jpg&hash=40e8c95d5c991c9876113e5c32d3c1a2a29732d6)
But inter-mixed in Chicagoland you have brown beams:
(https://www.interstate-guide.com/images190/i-190_il_wt_07.jpg)
Around St Louis the brown beams make quite the appearance. https://goo.gl/maps/T7p2HZjBJ5v (https://goo.gl/maps/T7p2HZjBJ5v)
IDOT generally uses the brown gantries (Not a fan personally of them), while ISTHA uses standard truss. However, they've been using box gantries with concrete pillars more recently, as seen here (https://www.google.com/maps/@42.4456772,-87.9577404,3a,75y,346.8h,89.23t/data=!3m6!1e1!3m4!1s8ilhyygIYJFlcUkXalmMBQ!2e0!7i13312!8i6656).
IDOT doesn't seem to use the brown gantries anymore and have replaced several of them with the fully braced design. I kind of liked them, as they were something different. They seem to blend in well in the city but not so much in the suburbs (where they're rarely used anyway)
The ISTHA box gantries with the concrete supports definitely have an awkward look to them and just seem outdo place.
Quote from: ET21 on March 10, 2017, 12:19:32 AM
Illinois uses mainly truss gantries:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages294%2Fi-294_il_st_45.jpg&hash=40e8c95d5c991c9876113e5c32d3c1a2a29732d6)
But inter-mixed in Chicagoland you have brown beams:
(https://www.interstate-guide.com/images190/i-190_il_wt_07.jpg)
You forgot the Chicago Skyway, which uses a mono tube design. (https://uploads.tapatalk-cdn.com/20170323/2c98b346f60eabf701a0d3e185066b5c.jpg)
Quote from: myosh_tino on March 23, 2017, 12:14:33 PM
There are 3 common types of overhead sign structures in use by Caltrans...
1. Truss (more specifically a Pratt truss)
(https://www.aaroads.com/california/images680/i-680_nb_exit_030a_04.jpg)
This is, by far, the most common gantry seen in California.
2. Box Beam
(https://www.aaroads.com/california/images680/i-680_nb_exit_002a_01.jpg)
While still pretty common on freeways in the San Francisco Bay Area, the Box Beam gantry was removed from Caltrans' standard plans in the early 2000's but many remain in the field.
3. Monotubes
(https://www.aaroads.com/california/images680/i-680_nb_exit_046a_01.jpg)
Monotubes are IMO, the least common of the 3 types of gantries seen in California but as the Box Beams are phased out, this style of gantry and the Pratt truss will be the only overhead sign structures left in Caltrans' standard plans.
In my opinion the more interesting part of California's overhead signage is the gantries that are not full-span. They use several designs that are cool looking and are not used in any other state as far as I know. It would be interesting to get an explanation of some of the advantages and disadvantages of these designs, and why no other states use them.
Here are some examples:
(This first one may be used in Nevada as well)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi3.imgbus.com%2Fdoimg%2Fbc2oam1mao1n220.jpg&hash=bc2eb3abd855101ceecf8b143071d044298ceb6f)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi4.imgbus.com%2Fdoimg%2F4combmon1a11e82.jpg&hash=db6f1781d2609c0cf0a068e3139399079e7d88b3)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi1.imgbus.com%2Fdoimg%2Facodmm4oncec891.jpg&hash=8cde8c8e75617386c5c0b5c8ab2b9fca43fb8236)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi3.imgbus.com%2Fdoimg%2Fccom7mon6d5d232.jpg&hash=02392acd48fab057ec37977d7e8e8021bd03ae2f)
The box truss on single pole upright cantilever support is a common design in many states (including Massachusetts). The only difference with the examples of California's design shown in the photos is that the box truss matches the panel width, and the upright diameter is smaller than more recent installations in other states. From the mid-1970s until the mid-2000s, it was commonplace in many states to specify a maximum diameter (usually 18 inches) for overhead sign support uprights. This requirement, which was for purely aesthetic reasons, became impractical for fabricators to meet with the adoption of the 2005 AASHTO Standard Specifications, and has been generally dropped since then.
Quote from: roadman on March 24, 2017, 09:17:19 AM
The box truss on single pole upright cantilever support is a common design in many states (including Massachusetts). The only difference with the examples of California's design shown in the photos is that the box truss matches the panel width, and the upright diameter is smaller than more recent installations in other states. From the mid-1970s until the mid-2000s, it was commonplace in many states to specify a maximum diameter (usually 18 inches) for overhead sign support uprights. This requirement, which was for purely aesthetic reasons, became impractical for fabricators to meet with the adoption of the 2005 AASHTO Standard Specifications, and has been generally dropped since then.
Thank you, this also explains why uprights have seemed to be thicker in newer installations around the country.
In Mississippi, they use the Modified Warren truss gantries.
In CT, new installations are either: 4-chord cantilever (side), 4-chord truss (full span), or monotube bridge (full span, as seen in the pic in the BC example on Pg1). Tubular arch (side and full span) were used on new installations until quite recently. Still lots of "angled supports" of various color schemes (grey, yellow, green, fluorescent green) around, and some older trusses and cantilevers. From the early 1980s through the 2000s, the angled support was most common on new installations.
I think in Spain we're a bit different. We use very different gantries (I've never seen box trusses, for example, except for supporting cameras, radars or electronic signage aswell of the panels), and usually, they're shorter in comparison with the BGS they hold.
The most common gantry type for new installs used to be Vierendeels, like we see in my local beltway, and were the most popular choice for many, many years. You can still see loads of them across the country:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FDoFNRvr.png&hash=530d3471ec2401f422755dde3133c7781e5a588d)
Some of them even date back to the 50s-60s as we see in this ancient gantry as Series E was only used in Spanish National roads (and this gantry use to be part of the N-III before it was relocated, that's the reason of the covered shields) back in that times:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FruG8m3H.png&hash=a06fe3df53b82374fe23a03f45594c9a65f55fb6)
They sometimes still use them in new installs, but now they're always light-weight versions, like this one:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fvc1AbCb.png&hash=a0e236ab0e97298138d871eae32c9690c07c65b4)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FH2IxW8G.png&hash=05a1d9edb65b8fcd2fe54a1bd6674a2e39a67c3e)
Here's a variation they do in Andalusian autonomical roads, with the logo of the Junta de AndalucÃa:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FljzVv5f.png&hash=6c7d442b45754e170d66e801dfc495ec2cd446df)
Now, in new installs they use Pratt gantries (quite rarely though), and seldomly they done that with older ones. Also light weight sometimes:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2F8WDbNzN.png&hash=151bd2ec4a59dbcdebfedfbbf69db9ec3bf154d2)
Or this simple yet boring box ones, which have become extremely popular on new signs, I believe because of their cheapness. The most common ones are also light weight:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2F37XkmgE.png&hash=315dc82a5df96fd54f4610c6e470b4b2a3a1d07c)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fasln1TX.png&hash=ba2a94a5710ccc202ba577782ecec8fa42ad496e)
Then you have the stranger ones; seldomly used for new installs now (except a few models), like this Vierendeels-Pratt hybrids, which I've only seen in my island, and not uncommon in new installs, here's a pair:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FeuYtg15.png&hash=816990247bc7ae4401aa317c2d70e3c03758cc8b)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FZ2dOdMe.png&hash=b3aea3654833956211866c2b9c12202c5402756e)
You can also find, very rarely though, tubular Vierendeels all across the country, which usually are quite old:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fp0nT0YS.png&hash=89c233fa71104d8160fc4582db62f9d8ab3759ad)
This ones used to be extremely common on my local beltway, though they've been all replaced and I have only seen a pair in the mainland:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FlxseoUv.png&hash=5f43f31065f2e86d90e0b9f173a17396a11e5e25)
Then, I've only seen these in Andalusia, Vierendeels-Howe hybrids, quite new even:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Flk7mvrG.png&hash=e2a88ee7d2acd81d73c13550ed3725f3f2fbccac)
And finally, the ancient square-tubular ones, which are very very very rarely seen:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.elcomercio.es%2Fnoticias%2F201604%2F27%2Fmedia%2F13404370.JPG&hash=4b3a237110febe6856171ee4891bd232f9f0bd1b)
Colorado's standard is now the single monotube. New Mexico uses a monotube with a horizontal support across the base of the signs. I'm also interested iin ground mount sign supports. Many states use I-beam posts that are self-supporting, but Nevada uses round signpost that uses back posts for wind resistance
California uses wood posts for ground-mounted signs.
Quote from: ET21 on March 10, 2017, 12:19:32 AM
Illinois uses mainly truss gantries:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages294%2Fi-294_il_st_45.jpg&hash=40e8c95d5c991c9876113e5c32d3c1a2a29732d6)
Actually, these triangular ones are unique to the Illinois State Toll Highway Authority (ISTHA). IDOT does not use them anywhere in the state.
Quote
But inter-mixed in Chicagoland you have brown beams:
(https://www.interstate-guide.com/images190/i-190_il_wt_07.jpg)
IDOT District 1 was a big user of these in the in 1980s and 1990s. They've also appeared in smaller numbers in District 5 (along I-39 and I-55 in Bloomington-Normal) and District 8 (along I-255).
IDOT usually uses these supports: https://goo.gl/maps/9T5ZAnPXMA22
Michigan tends to use very squared-off supports: https://goo.gl/maps/zJLPbfTnqUw
And MDOT also uses these: https://goo.gl/maps/6U7ovdXGPWx
Wisconsin has a few different styles:
https://goo.gl/maps/1ogNTNdiXfS2
https://goo.gl/maps/FK2A9yFAffS2
https://goo.gl/maps/oEdMwKLKEWP2
Indiana uses these: https://goo.gl/maps/Sgv93Wb3WAR2
For the three state's I've lived in, I like Florida's the best. They use a triangular truss style gantry for sign bridges and cantilevered applications. Florida is one of the most consistent states I've been to in terms of gantry designs. I like that.
Sign bridge:
(https://www.aaroads.com/southeast/florida010/i-010_eb_exit_362_09.jpg)
Cantilever:
(https://www.aaroads.com/southeast/florida010/i-010_eb_exit_351_02.jpg)
What I always found interesting is how FDOT mounts signs on the non-flat side of the triangle for sign bridges that cross both sides of the roadway:
(https://www.aaroads.com/southeast/florida095/i-095_nb_exit_339_03.jpg)
There are also a great deal of tubular arches in the Tampa area. Reminds me of being in a Rocky Mountain state:
(https://www.aaroads.com/southeast/florida275/i-275_sb_exit_045_05.jpg)
My least favorite of the states I've lived in is Texas (by far). There is a lot of inconsistency due to the heavy use of aesthetic concrete in place of traditional steel poles. When they aren't using aesthetic concrete for the poles, TxDOT uses I-beams tethered together to make a truss design.
TxDOT standard sign bridge:
(https://www.aaroads.com/texas/texas400/i-635_sb_exit_022d_03.jpg)
TxDOT standard cantilever:
(https://www.aaroads.com/texas/texas400/i-635_sb_exit_016_04.jpg)
TxDOT aesthetic design (one of hundreds of designs across the state–this is one of the least gaudy ones):
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.oscarmail.net%2Fhoustonfreeways%2Fimages%2Fkaty_2007-04-01%2Fi10_20070401_IMG_4659_approaching_610.jpg&hash=8ab01cd3c2abc28d92f454233c0b8a3f2369fe91)
Texas actually seems to vary by district. The El Paso District I know uses monotubes.
Quote from: Pink Jazz on April 03, 2017, 01:35:46 PM
Texas actually seems to vary by district. The El Paso District I know uses monotubes.
Yes, that is a newer trend I've noticed, especially in the districts that border New Mexico. Though, I've also seen a handful of monotubes in the Houston, Dallas, and Austin districts. I wish all of TxDOT would switch to monotubes exclusively.
Quote from: The High Plains Traveler on March 28, 2017, 10:17:55 PM
Colorado's standard is now the single monotube. New Mexico uses a monotube with a horizontal support across the base of the signs. I'm also interested iin ground mount sign supports. Many states use I-beam posts that are self-supporting, but Nevada uses round signpost that uses back posts for wind resistance
The standard in New Mexico is also the single monotube. The only instances where you'll see the monotube with the horizontal support are along I-25 and I-40 in Albuquerque near the Big-I. Other than that, just the single monotube is used.
The full-length gantry mounting posts for the following 4 states are similar in many ways, yet also different from each other.
Illinois (https://www.google.com/maps/@41.8427604,-87.6569697,3a,41.5y,313.33h,90.04t/data=!3m6!1e1!3m4!1sDf64-CIgRCNKkJow6IlERQ!2e0!7i16384!8i8192): Slightly angled vertical beams, 3 diagonal beams with none straight across.
Indiana (https://www.google.com/maps/@39.9305317,-86.1481359,3a,15.4y,235.48h,92.21t/data=!3m6!1e1!3m4!1sFQSz-Z2VOB_rUI_sgP5qrw!2e0!7i16384!8i8192): Straight up vertical beams (a bit thicker compared to the other 3 states), 3 diagonal beams with 3 beams straight across.
Ohio (https://www.google.com/maps/@39.9439052,-83.0124041,3a,20.3y,3.19h,92.91t/data=!3m6!1e1!3m4!1sRn-WVSitrqkrXYAATgHiEg!2e0!7i16384!8i8192?hl=en-US): Straight up vertical beams, 4 diagonal beams with none straight across.
Kentucky (https://www.google.com/maps/@39.0386764,-84.5913677,3a,67.6y,280.8h,86.89t/data=!3m6!1e1!3m4!1sdxcxPaf-V2g1GKXA_nFZ1g!2e0!7i16384!8i8192): Slightly angled vertical beams, 3 diagonal beams with 3 beams straight across.
Newer thread at https://www.aaroads.com/forum/index.php?topic=21307.0 –please use that one.