every situation is different
just because there is a car there i wouldnt walk away,
but i would take into consideration there maybe someone hunting there,
i would stick to any path, and glass far ahead looking for hunters,
person may or may not be hunting that field,
could be hunting trails leading to/from the plot,
could be a bird hunter walking and flushing,
could be a small game hunter,

where i hunt there are miles of trails in WMU's,
i would stick to the trail and not get off the trail till i reach an area i plan on hunting, if i see a hunter working i spot i was planning on,
either would back out heading to alternate spot i have in mind,
or if alternate spot is beyond the field/plot i would proceed quickly and quietly,

if someone decides to set up 100 yds from the car, or along a public trail, cant expect everyone to turn back and not use the miles of trails or acres and acres of land beyond that plot.