here in Argentina, we don't stop. Feigning a car crash and signaling for help are common and well known tactics to rob you.
In the road, they would, besides above pointed:
a. throw rockd at your windowshield, in order to make you steer and crash and/or stop.
b. bump you from behind, same intentions.
c. when you are stopped at a light, traffic congestion, obstacle, there will como like 10 young dudes and assault you and your vehicle. We call it "robo piraña", wich of course mean piranha robbery.
d.they have thrown mannequins to the road from bridges, so you would freak out and stop.
We are a very cynical society. All of us, when we have to cross the street, we don't care about the way the cars go. We always double check both ways. Because you can't trust even in that.
There is a belief, don't know if with some factual basis or not, that argentinean workers and professional tend to be very successful abroad, because we are used to survive.
Kinda what in the hollywood films they say about newyorkers.
So in Argentina, they would stop to watch the skeletons of everyone in the accident wither and whiten, and still would squint their eyes months later and think "could be a trap..."