There's no MMR section with EPM data in this cityXplorer™ Africa - Johannesburg, South Africa. Strange however that Garmin specifies city public transportation "Bus" under the features tab.
Seems like CX maps 2012.20 for New Zealand and South America (except Rio & Sao Paulo) don't have MMR data yet. Maybe it comes in 2012.30?

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City Public Transportation
  • Bus