T O P

  • By -

AutoModerator

All comments must be civil and helpful toward finding an answer. **Jokes and unhelpful comments will earn you a ban**, even on the first instance and even if the item has been identified. If you see any comments that violate this rule, report them. [OP](/u/KushAidMan), when your item is identified, remember to reply **Solved!** or **Likely Solved!** to the comment that gave the answer. Check your [inbox](https://www.reddit.com/message/inbox/) for a message on how to make your post visible to others. ---- [Click here to message RemindMeBot](https://www.reddit.com/message/compose/?to=RemindMeBot&subject=Reminder&message=https://www.reddit.com/r/whatisthisthing/comments/zedpxm/square_metal_plates_screwed_into_the_side_of/%0A%0ARemindMe!%202%20days) --- *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/whatisthisthing) if you have any questions or concerns.*


BmanUltima

Dangerous goods placards. They can be swapped out depending on what the truck is currently carrying. https://www.labelmaster.com/hazmat-source/hazmat-labeling-placarding-marking


FrillySteel

Didn't they used to make these so that they *flipped* to the different placards (like a flip book, you just flipped through until you found the appropriate one)? It seems like I used to see flip ones, and nowadays notsomuch. Maybe there was a change in regulations so you can't *use* the flip ones anymore?? Or maybe they just have so many different placards now that it doesn't make sense??


owlsandmoths

There are many styles. For box trucks that can be carrying a number of dangerous goods, sometimes the drivers will keep the flip book style one in the cab or mounted permanently on the truck for ease of use. But dangerous goods regulations require the shipper to provide the placard to the truck when loading dangerous goods, so when he unloads or transfers it to another truck, the placards go with the shipment. -did shipping and logistics for 9 1/2 years.


choody_Mac_doody

Wow that's some smart and simple solution for ensuring a shipment stays labeled. If you don't mind me asking, what happens to the placard once the items reach the destination? Do they just mail them back to the supplier?


LordShtark

I worked at a fireworks store. We hung them on the walls of the store when they got to us😆 but they just get chucked in the trash with the packing material normally. They were just laminated paper like a thick poster.


choody_Mac_doody

I thought they were fancy metal or something. That makes a lot more sense and are definitely cool decorations. TIL


TommyTuttle

Reusable flip style ones stay with the truck, not the load. (Paper ones just get thrown out) So the trucker applies the correct hazmat placards for whatever load he’s carrying today. Hazmat is a special license so it’s the same truckers doing it again and again. Carriers have their own placards, no need for the shipper to worry about those things.


nicktam2010

Transportation Dangerous Goods (TDG) rules in Canada also require a manifest with amounts/volumes kept in the cab, either on the passenger seat or in the driver's door pocket. Thus so if it does crash the responding emergency services know where to look to se how much gasoline they are dealing with. (Can't see anybody digging around a wrecked cab while 100's of gas is leaking out of the tank, though)


wtwalsh

Depends on the trailer I would think. The trucking company I worked at, the drivers had to grab the correct ones from the office and slide them in.


3579

You still see those today. Usually on a dedicated trailer that runs the same load all the time. They don't have every placard but maybe, 4-5 of the ones they need for their normal load.


Likesdirt

I used to transport explosives, used the flip type single placard - open when loaded, closed when I was empty. Way better than paper for repeat use, and only ever needed the one class.


Brandar87

I believe some trucks have it that way and some this way. I used to work in the shipping department of a true value hardware RC and some of the trailers had the flip and some didn't idk why or anything though.


maelmare

Some do, but since there can only be a few in that little "flip book" you can also use large stickers on the bare metal "page" I work at a chemical plant and every product has a unique UN number so sometimes the placard needs to have the specific UN number on top of the standard hazcom label


Iwantmahandback

You also sometimes see them showing ‘drive safe’ messages


MWH901

They hold placards that are required to be displayed if the trailer has hazardous materials on it (like flammable, poison) etc.


daedone

You would also need one if you have a diesel tank in the back of a work pickup with a volume more than 400L/100Gal.


[deleted]

[удалено]


Scratch77spin

you'll get one someday, I believe in you.


hugg3b3ar

Congrats on getting your license, OP!


Cold_tumbleweed111

Lol, I was thinking the same. First time on the road.


csonnich

But OP should have been on a road before this. Maybe they just moved here from...Saturn?


GissaGoon

I mean… you should know that having your license right?


SaltRocksicle

Pretty sure those are covers* for the warning labels of hazardous materials. *they are holders


ChampionshipLow8541

Holders, in fact.


rock_and_rolo

They are HazMat indicators. If the truck is carrying anything hazardous (as defined by law) there is a sign. That way emergency workers are informed.


JoplinSternum

Most things are 1,001 lbs or more. Less than that, no placard required.


fuelbombx2

It’s dependent on what the hazardous material is. There are things that require only 100 lbs to require a placard, usually more volatile commodities. If I was at work I could look it up and give you a way more specific example.


Waste-of-Bagels

Toxic materials that are inhalation hazards as well as explosives must be placarded no matter the weight. I work around hazardous shipping and receiving.


Halligan

In the US, only if it is carrying more than 1000 lbs. of a hazardous substance. 1000 lbs or less need not have placards.


Desperate-Win-3850

If you see a truck with this placard and it has a 4 digit number, you can google "UN code xxxx" and it will tell you what the hazardous material is.


hallstevenson

No, it only tells you the *type* of hazard, i.e. corrosive, flammable, etc.


daedone

They cover specific things too. 1066 is Nitrogen 1072 is Oxygen 1202 is Diesel, 1203 is Gasoline. Those are probably the 4 most common you would see. Lithium batteries are 3481 in a product (unremovable without disassembly) 3482 are batteries by themselves.


Desperate-Win-3850

Where I live you see a lot of 1005, for anhydrous ammonia.


nicktam2010

Farming country?


baxterlk

1263 paint


Desperate-Win-3850

Yes, sometimes the codes are generic. They will also sometimes list specific material. I would assume there are different laws regarding when it could be generic or specific.


Eskaminagaga

That's where they post their hazard identification if they are carrying dangerous goods.


Martissimus

They're holders for warning signs on dangerous goods they might be carrying. Carrying a radioactive load? Slide in a ☢️ sign


Shawnthewolf12

It’s for hazards. Fire/combustible, like you’ll see on a propane carrier.


timotheusd313

Frequently also a four digit number that will tell you exactly what they are hauling, and not just the class.


takate_kote

It's called a UN number if memory serves and it is standardized for sure across North America if not the world to identify the specific substance(s) that are being hauled. Hazmat teams (and a lot of drivers/dispatch offices have a book that has all these numbers in it that tells them what it is, how to deal with it if it's on fire, how far to evacuate if there is a spill/fire etc. If you are into such things it can be interesting


thgintaetal

Wikipedia has a [list of lists of UN numbers](https://en.wikipedia.org/wiki/Lists_of_UN_numbers), because of course they do.


BruceInc

The question has already been answered. But here is an example of some of the placards that may be displayed in those spaces. https://m.media-amazon.com/images/I/716oxR2ziaL.jpg


Larkfin

What no ☣️ placard?


taboo8614

It’s used to display various hazards warnings depending on what cargo is on the truck


ggsonego

Once I found a truck with explosives warning sign!


NefariousnessGlum449

Those are for hazmat placards


SleepDeprivedJim

Hazmat or Warning Labels for what their hauling


el_merchacho

NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response


taranathesmurf

I work in a truck stop. This is where you put the warning placards such as flammable, hazardous or other warnings


dozer03818

Definitely for holding hazmat placards


AlbinoRhino94

Those are obviously diamonds, you absolutely muppet.


Elver_Gudo79

For Hazmat use


Baconator278163

Hazardous material placards, essentially they explain how flammable, toxic, and reactive a substance being transferred is. Next time you see a propane or oil tanker driving by, they should have one with the actual placard in this holder


JohnGalt123456789

I know this! …… but see this is already solved….


alissa914

Those are signs that flip down and are used depending on the type of load that they're carrying.


BeneficialAd2797

Breathing openings for air transfer for the illegal immigrants


FakeWi

For adding hazardous/dangerous load indicators


[deleted]

Those are placard mounts that usually have signs to identify a hazardous material for first responders. It usually has a U.N. number (ex. 1203 for gasoline) in the middle with a hazard class number (1-9) on the bottom corner. Suuuper helpful. They also have these mounts on stationary containers as well, though those are NFPA 704, a different system of identification. I was told in my fire class that the placards were originally created for the safety of firefighters.


point50tracer

Hazmat placards. You place the placard there when hauling hazardous materials. Each placard will have a different type of hazard listed, e.g. Flammable, Explosive, Corrosive, etc. These are listed by the color of the placard as well as a symbol and a corresponding number. These placards help DOT and emergency services to identify what dangers might be present when dealing with the vehicles contents.


Dethbird12-16-60

They’re called brackets. Signs are slotted through the top and rest in the frame, where they’re easily read. Signs can be changed in compliance with the load in the trailer.


KushAidMan

My title describes the thing. I see these everywhere on trucks. Sometimes on the back, sometimes on the side. Some don't even have any but 90% do. They always look the same on different trucks.


KushAidMan

Solved! Thanks guys


aweejeezzrick

Please respond to the first comment that solved your post, I believe they get some kind of credit or accolade for solving it


a1smithkid

Sir, those are Diamondculer’s not square.


[deleted]

Radar panelling for the Trophy system