On a sign for a taxi company, which of the followings is correct:

Advance bookings only


Advanced bookings only

and why?

  • Related but not (I think) a duplicate: What is the correct form of "advance" in the sentence "My advance search?" – Sven Yargs Dec 20 '15 at 2:07
  • 3
    Advance is correct, since the point is that this taxi service is limited to those who book (reserve, bespeak) their rides in advance of (before) actually taking them. Advanced bookings would mean bookings that require a highly developed knowledge of how to book a ride, and a taxi service naturally wants to keep the process simple enough so that there is no occasion for that. – Brian Donovan Dec 20 '15 at 2:21

The correct form is advance booking, with advance used as an adjective.

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