Mapsets (both TomTom/Teleatlas and Navteq) have been coming with HNR files for quite some time.
The theory behind these files is that they aid in the speed of calculating routes...particularly longer routes measured in triple digit kilometers/miles or more..by piecing together bits of pre-calculated pre-configured routes instead of starting from scratch every time. This can decrease the time it takes to calculate a route by a substantial amount of time.
The prevailing (and correct) advice ...
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