There are no stretches with the control of the average speed near where I live and I could not test the .spc files if they work. My tests I made them with fake points created by me.
gpspassiont can safely use the SCDB file, the category 4 has the speed, and the DIRTYPE is 0, that is all the directions, for which the angle of the direction does not matter, (DIRECTION).
The problem is that it has the alert even if it is in the opposite lane, to fix it should modify the txt file with SPUDIGO, but 6400 points are so many to choose and change ......
The calculation of the average speed works even if the speed is not specified, -,0, -, , - ,, -,X, - , (value zero, with empty space or without empty space or with the letter ics).
In the case that the speed is not present or specified we have two possibilities, through the sys or the plugin.ini:
use the speed of the map: use_road_speedlimit = 1
or do not even use the map speed: use_road_speedlimit = 0
With the use of the speed of the map it works all regularly as if the speed was set in the txt file, here the limit of the road is 50 km/h:
Spoiler: image
If we do not even use the road speed limit, the software has no references regarding speeds and simply detects and reports the average speed, here the limit of the road is 90 km/h:
Spoiler: image
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