Thread: Bridge weight limit sign confusion..

Hi, can anyone please explain a bridge sign seen on a private property just of the main road which has written on it:

Heavy vehicle bridge limits
Axles Class 1
Gross 30% Class 1
Speed 10km/h

Question is, what is exactly the weight for class 1 ??
Does this sign mean the bridge is on it's last legs and using it with a small truck is plain crazy?
Who measures this? and do these signs change when the bridge deteriorates?

I googled many opinions and everyone has got a different interpretation..
The worst comes from gv nz with many little round dots and letters inside that doesn't explain anything.
For example, can the bridge been used by a truck carrying a 20ft empty shipping container? (they usually have two rear axles, I think)
can the bridge been used by a normal sized tractor and trailer or motor home?...