Sometimes another good way of identifying relationships is to ask if we would hold any data belonging to the other entity in either of the two entities being considered. Again, an indirect relationship exists via agency and booking. Yes, customers make payments that are of interest to the system. No, by vehicle category the type of vehicle is meant e.g. HGV, PSV etc. Therefore there is only an indirect relationship through Booking.
Drivers receive a payment for the work done.
However in this instance the Payment entity refers to a payment made by a Customer for a completed booking. It is therefore important to be clear exactly what is meant by each entity name. There seems to be a relationship in that only drivers with certain licenses can drive certain vehicle categories. Although this could be an indirect relationship. It is therefore marked on the grid but may require further consideration later.