Hi Polo, We've used an AA one for car driving and I assume it would work on the same principles. Think of all the aspect of the work that could increase the risk... Length of shift Age / experience of driver Lighting / Temp conditions Loads carried / distances carried Work surface Blind corners One way / two way traffic Pedestrians present Past incidents of poor behaviour / incidents !!!! Etc Etc There'll be some sort of algorithm used to give you a numerical rating of some kind. It worked pretty well for our drivers but once we'd done it for one year we decided it could be easily done in-house