Felix,

  

O.k. so there must be another reason.

Maybe its as well related to road_speed or road_class?
(Garmin may think that the lower the road_speed the higher the chance 
that there are buildings that obstruct GPS reception, or the lower the 
accuracy of the maps, cause minor roads are not that well mapped as 
major roads??).

The road_speed of my maps is only 0,1 and 2 -could that be the culprit?
    

For sure, there's lot's we don't know. For example, that 3 byte field.
We don't really know what the various bits are used for. Someone a
while back posted an analysis (and their theory) on what the values
meant but nothing more has come from that yet.

Cheers,

Mark
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