http://strangemaps.wordpress.com/2007/02/
A thematic map is a simple map made to reflect a particular theme about a geographic area. Thematic maps can portray physical, social, political, cultural, economic, sociological, agricultural, or any other aspects of a city, state, region, nation, or continent. This is a thematic map showing what side of the road traffic drives on.
Dark blue: drives on left (mainly British ex-colonies).
Light blue: used to drive on right, now on left (Namibia).
Purple: used to have mixed system, now drives on right.
Light red: used to drive on left, now on right.
Dark red: drives on right.
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