Where may a taxi driver stop to pick up and drop off passengers on an urban road?

The correct answer: At any place where parking is permitted, as well as alongside red-and-white painted kerbstones, provided that the taxi does not obstruct traffic.

A taxi driver may stop to pick up and drop off passengers anywhere parking is permitted, and also beside red-and-white painted kerbstones, as long as the taxi does not obstruct traffic. A bus stop is not on that list.