In recent years, there has been a trend for bus companies to discontinue higher numbers in favour of single digits for their routes, with or without prefixes/suffixes. This has meant several double digit numbers have been discontinued in many areas altogether. A recent example is the changing of Stagecoach’s Oxford - Swindon route from 66 to S6. While 66 remains a popular number for bus routes due to its memorability (common with repeated digits), are there many examples of double or triple digit numbers which are rarely used for bus routes, or not even used at all?
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