Coming up from Patterdale towards the Hole-in-the-Wall path, we found this sign. Now I know that it means that lorries heavier than 7.5 tonnes cannot cross, but I realised that I didn't know what mgw stands for. We guessed right with "maximum gross weight". Usual Physics teacher rant about tonnes measuring mass and thus the word "weight" being incorrectly used. Gross here means the total of everything - the vehicle and the load.