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The Ordnance Survey Routemaster series of mapping was a replacement for the Quarter Inch map series at 1:250,000 scale.
Routemaster sheets covered a larger area than the previous Quarter Inch maps, with 9 sheets covering the whole of Great Britain, rather than the previous 17 sheets. They were also the first OS map series to have photographic covers, and from 1980 also showed Primary Destinations.
The series was replaced by the Travelmaster series in 1993.
SABRE Maps coverage
The earliest OS Routemaster was published in 1978, and so will not be out of copyright until 2029. It cannot, therefore, appear on SABRE Maps until that date.