The term "halted traveller" is usually associated with German romantic painters like Caspar David Friedrich, to describe a person seen from behind facing a lanscape. The lonely wanderer appears to have been halted by the view of the landscape.
This implies to us as a viewer that there is perhaps more to the landscape than we see. One can also identify with the figure. His posture invites you to imagine what he feels facing this landscape in front of his and your eyes.