Close to one hundred illegal immigrants were struck .
Close to one hundred illegal immigrants were killed on San Diego County freeways over a five - year span in the late 1980s , prompting the creation of a highway safety sign to caution drivers about migrants crossing the road .
Close to one hundred illegal immigrants were struck and killed on San Diego County freeways over a five - year span in the late 1980s , prompting the creation of a highway safety sign to caution drivers about migrants crossing the road .