Hello,
the waiter and cook IDs are unique per restaurant. For delivery drivers, as far as we can see, this is never mentioned in the specification.
Is this also per restaurant or are these global?
Thankss in advance 
Delivery driver ids are assigned per restaurant (not globally) and are reset each evening.
in the spec page 20 line 29-31, following is stated:
Drivers are seen as interchangeable, they do not have ids assigned at the start of the simulation. To keep track of their actions, you will assign them ids starting from
id = 1per restaurant at the moment they receive meals each evening.
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