Quick Answer: What Signs On Tractor Trailors Mean?

What do the diamond shaped signs on trucks mean?

Have you ever noticed diamond – shaped signs on the back or sides of a semi- truck trailer and wondered what they are and why they’re there? They’re called HAZMAT placards, and they provide details about the kind of cargo a truck is carrying.

What do truck signs mean?

Truck Traffic Signs alert drivers of large motor vehicles approaching, therefore everyone must utilize caution. Post Truck Signs to warn drivers of trucks on the road or to alert trucks of weight limits or safety rules.

What does 1993 mean on a tanker?

UN 1901 to UN 2000

UN Number Class Proper Shipping Name
UN 1991 3 Chloroprene, inhibited
UN 1992 3 Flammable liquids, toxic, n.o.s.
UN 1993 3 Flammable liquids, n.o.s.
UN 1994 6.1 Iron pentacarbonyl


What does the truck downhill sign mean?

Traffic sign with truck going downhill meaning. At railway level crossings with boom gates and lights this sign advises traffic and pedestrians they should wait until it is safe before crossing.

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What is the diamond sign?

Diamond. Warning. These signs alert you to special road hazards. Words or pictures on the sign will show you why you need to slow down or use extra cau tion.

What does a red diamond sign mean?

What do the big diamond -shaped signs with red yellow and blue diamonds mean? Red – Fire hazard. Blue – Health hazard. Yellow – Reactivity. White – Specific hazard.

What does a yellow truck sign mean?

This class 1 retroreflective yellow truck sign is a road obstacle warning sign. A warning sign is a type of traffic sign that indicates potentially hazardous conditions on or adjacent to the road which may not be readily apparent to a driver.

What does a wrong way sign mean?

The WRONG WAY sign may accompany the DO NOT ENTER sign. This rectangular red and white sign is a traffic regulatory sign. If you see one or both of these signs, drive to the side and stop; you are going against traffic. When safe, back out or turn around and go back to the road you were on.

What does a blue sign mean?

These signs tell you where you are, which way to go and the distance. Blue: This color is also used for guide signs. These signs tell you about services along the roadway such as rest areas, hospitals, gas stations, and lodging.

What is NA1993?

NA1993 is a US only identification number. It is used for transporting combustible liquids in the US. DOT puts information about Combustible Liquids under the Flammable Liquids headings because they are liquids with vapors that burn just at temperatures beyond the criteria for a normal flammable liquid.

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What fuel is 1993 placard?

1993/1203 Placard – Class 3 Flammable Liquid.

What placard is diesel?

The PHMSA letter states definitively that full diesel loads cannot carry a 1203 placard. They must be marked with the NA 1993 placard. That interpretation also applies to multi-compartment tanks that are transporting just diesel.

What is a merge sign?

The merge sign is a regulatory sign. Drivers who encounter a merge sign are warned that two separate roadways will converge into one lane ahead. The merging traffic sign will typically indicate which lane should be merging into the other. Merging vehicles must yield to traffic on the main highway.

What does the T intersection sign mean?

The T – intersection sign means that the road you are on ends ahead. You must prepare for a left or right turn. If there are more than one lane in your direction, make sure you are in the proper lane for your turn and start slowing down. You must stop and yield to vehicles on the through road.

What does this sign mean hill?

This sign gives you an early warning that the road ahead will slope downhill. Looking at the sign from left to right will show you whether the road slopes uphill or downhill.

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