Weight Restricted Roads In The UK?

I'm a newly qualified HGV driver and I drive a Scania R450 Tractor Unit combined with an Urban trailer. In order for me to get to my delivery there are some 18t and 16.5t weight restricted roads. But I know that my gross weight is less than both of these, and I only have half a load on at the most. Basically do

I'm a newly qualified HGV driver and I drive a Scania R450 Tractor Unit combined with an Urban trailer. In order for me to get to my delivery there are some 18t and 16.5t weight restricted roads. But I know that my gross weight is less than both of these, and I only have half a load on at the most. Basically do the weight restrictions apply to the type of vehicle, or does it apply to the actual weight of the vehicle!?

Other answer:

Funkynorm:
Applies to the maximum authorised mass of the vehicle – its maximum loaded weight, not what it happens to be at the time.
There may be a plate on the sign setting different times for the restriction and or saying that it is "Except for access or loading or unloading"
You need to look at the signing carefully.
Most responsible companies will give you the authorised routes for such cases.
Percyqted:
Weight restricted roads 7.5t 18t etc apply to the maximum permitted weight of the vehicle (the plated weight) regardless of the actual load they are carrying
Where weight restrictions are applied to weak structures such as bridges then that is usually the gross vehicle weight.
MVW = Plated weight
GVW = Actual weight at time.

To save arguments assume it's means your plated weight or MAM. Most companies on regular delivery work have approved route plans available on request.

Skoda John:
It applies to your maximum.plated weight.
Even empty the restriction applies. This is why is says MAM. Maximum.Authotised Mass. On the sign.
All a police office has to do.us read the plate then nick you.
Your HGV instructor should have covered this.
Jesk:
these restrictions are your total GVM, combined weight of your vehicle, trailer, load, fuel and anything else that might add to your total weight, hence it is important to know how heavy you are with your load