Sidewalk (Formal or Informal)

You can see the space in the red box between the main and service road.
What should we code for sidewalk? (it does not look a formal sidewalk)

I think you can code that as a sidewalk

I would not. It looks like a median, and the pedestrian seems to wait for the possibility to cross the road, not to go along.

This is not a Sidewalk because sidewalk is built at the ‘side’ of a road not in the center.