Bridge Weight Limit Sign: What does NNT mean?

My guess. It's a screw up by the county road commission.

There is likely a template system to get signs made up. The clerk responsible was told to make a 26T weight limit sign. They could not find a sign for single weight on the list of predefined signs in their program, so chose the closest they could find.

Instead of simply deleting the NNT before sending it to the printer (if the program even allowed it) they just put in the weight for semi.

Printer got a valid order, and didn't know/care it was meaningless. Road crew got a valid work order with a valid sign to install and didn't know/care it was meaningless.

Oh, and I'm guessing N simply short for Number. So NNT = Number Number Tons

Happens all the time in software templates. I used to go to a website that collected such things.

 

Not sure why but ZZ Top came to mind when i saw it.

 

where is that sign?

Location I mean.

 

by the bridge

 

really?

Who would have thought.

 

Number Needed in Tons

 

No New Trucks. Pre-emissions only. There is a troll under the bridge who will poke a hole in your DEF tank if you go over that bridge.

You haven't had to deal with this before?

 

Probably some type of typo. It's unenforceable due to not meeting the one of the main guidelines in the MUTCD (Manual on Uniform Traffic Control Devices) Section 1A.02 part 02 guideline C.

Section 1A.02 Principles of Traffic Control Devices
02 To be effective, a traffic control device should meet five basic requirements:
A. Fulfill a need.
B. Command attention.
C. Convey a clear, simple meaning.
D. Command respect from road users; and
E. Give adequate time for proper response.

They throw out cases all the time based on "lack of understanding" within a short period of time.
Ask me how I know.

 

W = the overall gross weight on any group of two or more consecutive axles to the nearest 500 pounds.

L = the distance in feet between the outer axles of any group of two or more consecutive axles.

N = the number of axles in the group under consideration.


Actual weight = 12,000 + 17,000 + 17,000 = 46,000 pounds.

N = 3 axles

L = 20 feet



https://ops.fhwa.dot.gov/freight/publications/brdg_frm_wghts/