We (Belgium) don’t illuminate highways as a standard anymore.
Only obliged to light junctions & during bad weather.
Roads are also fine regards holes and such like. (I ride a motorbike so I’m fairly exposed to any issues)
Be very careful on roundabouts…. Belgians think it’s normal to join that you can turn left by driving all the way around the outside of a 2 lane roundabout. Highway code used to be written that way (allegedly)
Tailgating is normal as is undertaking on the highway
The pulling out from the right thing is only valid in built up areas but still rather surprising all the same.
Is the xmas market in Brugge really that good (or are you coming to watch some cyclocross as the same time)? I hear Koln or Aachen are much better.