What are Major Maps?
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Map files that have only major highway information.


What is the purpose of Major Maps?
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This saves disk space if the user ONLY wants highway information 
and wants to remove certain maps but would like to retain information 
on major interstate highways.


Are these Major highways included in individual maps?
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Yes. But only for that state, or country.


What does NA_Major.fbl include?
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This is Major highways for North America (US + Canada).