Bullying and taunting people does not violate the self harm rule, though if the bullying constitutes encouragements of suicide (e.g, "You should kill yourself."), it would in that case violate it.

Running into traffic with the intent to escape or flee, but getting harmed in the process is not self-harm.  The intent is to escape, not to inflict harm upon themselves.  If they ran into traffic to kill themselves, that would be intent and expression of suicide.   The intent is important.