(b) The provisions of subsection (a) of this section shall not apply to those areas which have been temporarily closed for racing sport events or which may be set aside by the Director of the Division of Natural Resources within the state park and recreation system for exclusive use by motorcycles or other recreational vehicles.
(c) Every person convicted of reckless driving is guilty of a misdemeanor, and upon a first conviction thereof, shall be confined in jail for a period of not less than five days nor more than ninety days, or fined not less than twenty-five dollars nor more than five hundred dollars, or both, and upon conviction of a second or subsequent conviction thereof, shall be confined in jail not less than ten days nor more than six months, or fined not less than fifty dollars nor more than one thousand dollars, or both.
(d) Notwithstanding the provisions of subsection (c) of this section, any person convicted of a violation of subsection (a) of this section who in doing so proximately causes another to suffer serious bodily injury shall, upon conviction, be confined in jail not less than ten days nor more than six months or fined not less than fifty dollars nor more than one thousand dollars, or both.
(e) For purposes of subsection (d) of this section, "serious bodily injury" means bodily injury which creates a substantial risk of death, which causes serious or prolonged disfigurement, prolonged impairment of health or prolonged loss or impairment of the function of any bodily organ.