Copenhagen - Taxi
Taxis in Copenhagen are neither of a special brand, nor any particular colour. As in many other places they have a 'taxi' sign on the roof, and the little green light lit, inside the windscreen, when available. You can hail a taxi anywhere you like, or find them around stations and hotels where the Taxi sign indicate their parking area.
You never discuss prices with taxi drivers and they will always put the meter on. Tips are generally not given in taxis.