What should you do?
If you are driving a goods vehicle heavier than the figure, take another route; cars can continue as normal.
How to recognise it
A red ring with a black lorry carrying the figure 3t, crossed by a red diagonal bar.
Common confusion
Compare with the Maximum gross weight sign, which has no diagonal bar and is used for traffic management limits.
Explanation written by the My Driving Test editorial team using the Department of Transport Traffic Signs Manual conventions and the RSA Rules of the Road.
