The woman is being an irresponsible driver.
irresponsible /ˌirɪˈspɑːnsəbəl/ adjective
[more irresponsible; most irresponsible]
: not having or showing maturity or good judgment : not responsible
He's too irresponsible to keep a job for more than a week.
She made irresponsible comments that helped cause the riot.
It would be irresponsible to ignore the threats.