system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why deer behave differently when confronted

Deer are known to be extremely cautious creatures and even the slightest sounds can spook them. However deer often freeze up when cars are riding by. Are they scared and freeze up or are they curious and waiting to see what will happen?
gpt
Scared perhaps and also waiting. 

Deer will run fast away like you said.  But they also will lay completely still if a potential predator is nearby and they think that the predator doesn't see them.  

Once they feel they are spotted they will likely take off.

I've had deer do this many times.  Young fawns especially will lay still even if their mom runs away (possibly drawing predators away).  They'll lie and wait for mom to return.