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When we look further then we see lines such as:
a = "0_int", 255, 255, 0
A = "0_ext", 255, 0, 0

The first letter identifies the type of road, lowercase stands for inside color, uppercase stands for outside color. The 3 numbers represent the color in RGB, 255,255,0 = yellow and 255,0,0 = red. We can see on the picture that the highway in the Karl scheme is yellow with a red line on the outside. Suppose we want to change the motorway color in a special green color, this color is 153,255,153. Now we change the lines to:
a = "0_int", 153, 255, 153 (Innenfarbe)
A = "0_ext", 255, 0, 0 (Ran dfarbe)

Road types:
a = motorway, autobahn
b = U roads, U- und Europastrasse (aber nicht Autobahn bzw Schnellstrasse)
c = highway/federal highways, K-roads, bundesstrasse
d = highways, large major roads, bundesstrasse
e = road K and U, ausserort Verbindungsstrasse
f = connecting roads within the city, innerorts Nebenstrasse
g = one-way streets, verbindungsweg
h = side streets - city center, nebenstrasse in der Stadt
i - r = ?
s = highway, schnellstrasse
u = unpaved roads, nicht asphaltiert
v = poor road, slechtes
z = pedestrian precinct, fussgaengerzone