Good lighting is an essential part of a cycle path which is to be used after dark. Without it, social safety problems creep in. People start to wonder what is hiding in the shadows.
While Assen is a very safe place, it wouldn't do to give people any reason to be scared to cycle at night, or for them to be scared to let their children cycle at night. So, here we have a rural cycle path at night, showing the lights which keep subjective and social safety high.
Note that there are no lights on the road at this point, but the cycle path is still properly lit.