In case of any vehicular emergency, such as a temporary malfunction or breakdown of equipment, a driver may complete his run by driving for not more than 12 hours in the aggregate following 8 consecutive hours off duty, without being in violation of the provisions of Section 11-1419 of the Illinois Vehicle Code, if such run could reasonably have been completed without such violation.
Ill. Admin. Code tit. 20, § 1250.20