Sub-section(8) of Section 60A of the EA as quoted below says:
"(8) This section shall not apply to employees engaged in work which by its nature involves long hours of inactive or standby employment. "
Company drivers are mostly just hanging around or standing-by. If this is also the case of your company driver, he may not get overtime as the law is not applicable to him. Tell him to consult the Labour Office for their official opinion.