Limited approach is used when two signals are not within safe braking distance. The trainengineer has to reduce speed before passing the next double yellow signal.
Picture 43.1 (thanks to ferrosteph)
This signal also exist in the contraflow.
A distant signal can never display the limited approach.
You may find these signal in triangles, for example Aarschot. The signals in the triangle are close to each other, they demand an approach signalling..
1) An example. An east-bound train is signalled straight through. An other train diverges
2) Now an east-bound has to be diverted. A speedrestriction will be announced and no approach signalling is needed.