setting vehicle_profiles.xml

In a searching in the file "vehicle_profiles.xml" for the road settings.
I can find the following:
<road_class_parameters>
  <id>0</id>
  <speed_extra_urban>130</speed_extra_urban>
  <speed_urban>80</speed_urban>
  <speed_restrictions>yes</speed_restrictions>
 <preference>50</preference>
</road_class_parameters>

I cannot the find the settings for enabling/disabling a road type in the file "vehicle_profiles.xml.
Where are these settings stored???